3, can also be used for the Hall measurement. Increasing the temperature coefficient C. Increasing the susceptibility of measuring instrument D. Decreasing the frequency of recalibration In this page you can learn various important voltmeter multiple choice questions answers,mcq on voltmeter with answers,mcq on voltmeter,sloved voltmeter objective questions answers, voltmeter multiple choice questions answers etc. D. K. Schroder, Semiconductor Material and Device Characterization, 2nd Edition, John Wiley & Sons, New York (1998). c) Equal View Answer, 6. d) Ionizing b) eEH/b Q5. Automotive fuel level indicator. Hall Effect was discovered by Edwin Hall in 1879. One then obtains the equation, Thus, by measuring the Hall voltage VH and from the known values of I, B, and q, one can determine the sheet density ns of charge carriers in semiconductors. In Hall effect, the output voltage produced across the crystal is due to. Since the electrons are travelling through a magnetic field, they are subject to an upwards Lorentz force and so drift to the top of the bar whilst maintaining their horizontal motion. 2. no holes or nonconducting islands or inclusions), thin-plate sample containing four very small ohmic contacts placed on the periphery (preferably in the corners) of the plate. Which of the following is true about dark field microscopy? Q.7 for measuring high impulse currents, the best type of shunt is. The main principle of operation of such indicator is position sensing of a floating element. Clearly, it is possible to determine the sign of the mobile charges in a current carrying conductor by measuring the Hall voltage. D. C. Look, Electrical Characterization of GaAs Materials and Devices, John Wiley & Sons, Chichester (1989). Total radiation pyrometers are used to measure temperature in the range 700°C to 2000°C. We use cookies to give you the best online experience. In some cases, it is convenient to use layer or sheet density (ns = nd) instead of bulk density. A sign of, uh, charge of the ions. Which of the following represents correct expression for Lorentz force? (Note that the force on holes is toward the same side because of their opposite velocity and positive charge.). Primary concerns are (1) ohmic contact quality and size, (2) sample uniformity and accurate thickness determination, (3) thermomagnetic effects due to nonuniform temperature, and (4) photoconductive and photovoltaic effects which can be minimized by measuring in a dark environment. Figure 3. c) eEH D. L. Rode, "Low-Field Electron Transport," Semiconductors & Semimetals. It was discovered by Edwin Hall in 1879. View Answer, 8. If a material with a known density of charge carriers n is placed in a magnetic field and V is measured, then the field can be determined from Equation 11.29. Which of the following bridge is called Wein-bridge? You can update your cookie preferences at any time. b) Magnetic The Hall effect can be used to measure magnetic fields. n or p type is very important. a) Electronic If the conducting layer thickness d is known, one can determine the bulk resistivity (r = RSd) and the bulk density (n = nS/d). Theories of electrical conduction were constructed with varying degrees of success, but until the advent of quantum mechanics, no generally acceptable solution to the problem of electrical transport was developed. Sphere gap is used to measure: AC Voltage; DC Voltage; Both of these; None of these; Correct answer: 3. a) Magnetic field Each question carries 1 point. J. (C) Wattmeter. E. H. Hall, "On a New Action of the Magnet on Electrical Current," Amer. Conveniently, the same sample, shown again in Fig. Directionality of the IMF. To obtain the two characteristic resistances, one applies a dc current I into contact 1 and out of contact 2 and measures the voltage V43 from contact 4 to contact 3. Since sheet resistance involves both sheet density and mobility, one can determine the Hall mobility from the equation. The Lorentz force is given by The Hall effect is illustrated in figure 1 for a bar-shaped sample in which charge is carried by elec… Explanation: Hall Effect transducers can be used to measure linear and angular displacement and magnetic field etc. Drop across the crystal is due to the current passed through it. 10. All Rights Reserved. Repts. For the first time, this allowed scientists to quantify the current-carrying capability of the material and carry out meaningful comparisons between different samples. Figure 26: Hall effect for positive charge carriers (left) and negative charge carriers (right). (a) Does the sign of the ions … Coronavirus (Covid-19): Latest updates and information, http://en.wikipedia.org/wiki/File:VanderPauwContactPlacement.jpg. Hall Effect transducer can be used to measure ___________ d) Lorentz Voltage The voltage or electric field produced due to the application of magnetic field is also referred to as Hall voltage or Hall field. Optical pyrometers may be used to measure temperatures up to, and even in excess of, 3000°C. View Answer. Which of the following represents the output of Hall Effect transducer? a) 100 V. b) 200 V. c) 1000 V. d) 5000 V 1. Force exerted by magnetic field in Hall Effect transducers is ____________ D. All. Later, it became obvious that the resistance alone was not comprehensive enough since different sample shapes gave different resistance values. Sanfoundry Global Education & Learning Series – Instrumentation Transducers. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Um, And in here, the sign of the charge. c) Super conductors This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on ” Hall Effect Transducers”. Ballastic galvanometer can be used to measure the mutual inductance. View Answer, 2. © 2011-2021 Sanfoundry. All of these. Sanfoundry Global Education & Learning Series – Instrumentation Transducers. This quiz section consists of total 10 questions. RA and RB are related to the sheet resistance RS through the van der Pauw equation, The bulk electrical resistivity r can be calculated using. Next, one applies the current I into contact 2 and out of contact 3 while measuring the voltage V14 from contact 1 to contact 4 using a geometry shown in figure 3. c) Linear displacement A Hall effect transducer measuring small distances. May 18, 2017 by admin « Back CONTENTS Next » 1. Math. There are practical aspects which must be considered when carrying out Hall and resistivity measurements. Calibration of instrument is an important consideration in measurement system. A. d) None of the mentioned (B) Voltmeter. 3. High frequency and impulse currents are measured using: Inductive elements; Hall effect devices; Faraday effect devices; All of these; Correct answer: 4. Hall Effect is clearly visible in _______________ d) Electric force d) camera attached stereomicroscope. View Answer, 7. This quiz contains practice questions for Measurement Of Physical Quantities (O Level).There are explanations for some of the questions after you submit the quiz. Rev. Figure 2. Examples of Van der Pauw configurations are shown in figure 2. 10.05 (2000). b) Emf We prepared the Hall Effect Transducers Multiple Choice Questions for your practice. b) BV To measure the Hall voltage VH, a current I is forced through the opposing pair of contacts 1 and 3 and the Hall voltage VH (= V24) is measured across the remaining pair of contacts 2 and 4. Hall Effect is a/an _____________ D. Coaxial tubular. The Hall effect can be used also to measure the density of current carriers, their freedom of movement, or mobility, as well as to detect the presence of a current on a magnetic field. If the measurement apparatus is set up as shown, the Hall voltage is negative for n-type semiconductors and positive for p-type semiconductors. The instrument used to draw clear magnified sketches of objects under microscope is . The Hall effect can be used to measure the average drift velocity of the charge carriers by mechanically moving the Hall probe at different speeds until the Hall voltage disappears, showing that the charge carriers are now not moving with respect to the magnetic field. a) BeV (B) slow rotation of rotor with only current coil excited. This leads to a potential difference between the two sides of the sample, that can be measured as the Hall voltage VH. A constant current I flows through the bar and the entire bar is subject to a uniform magentic field B, which is directed into the screen, perpendicular to the current flow. This can either be … The basic physical principle underlying the Hall effect is the Lorentz force. a) True 5 Points. Hall Effect transducers attain equilibrium instantaneously. The Lorentz force is given by, The Hall effect is illustrated in figure 1 for a bar-shaped sample in which charge is carried by electrons. d) B The Hall voltage measurement consists of a series of voltage measurements with a constant current I and a constant magnetic field B applied perpendicular to the plane of the sample. R. Chwang, B. J. Smith and C. R. Crowell, "Contact Size Effects on the van der Pauw Method for Resistivity and Hall Coefficient Measurement," Solid-State Electronics. You can get the Quiz Answers after submitting all quiz questions. In addition, the ohmmeter may also be used to determine the condition of semiconductor devices such as diodes and transistors. Which of the following meter is an integrating type instrument? Former method can be used for AC only and the later method can be used for both AC and DC Former method can be used for DC only and the later method can be used only for AC Ans. Online Questions and Answers Topic Outline. C.Carrier concentration Your Comments. Answer b . The sheet resistance RS of the semiconductor can be conveniently determined by use of the Van der Pauw resistivity measurement technique. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam. This led to the definitions of carrier density n and mobility µ  (third level of understanding) which are capable of dealing with even the most complex electrical measurements today. RA and RB are calculated by means of the following expressions: The objective of the Hall measurement in the Van der Pauw technique is to determine the sheet carrier density ns by measuring the Hall voltage VH. Hall potential is inversely proportional to magnetic flux density. E. H. Putley, The Hall Effect and Related Phenomena, Butterworths, London (1960). a) A b) B c) C d) D Ans: (c) 175. b) False a) Wein bridge b) Maxwell bridge c) Schering bridge d) Anderson bridge Ans: (b) 176. B. Bifilar strip. A. a) EH/b a) Double View Answer, 10. Impulse voltage. View Answer, 3. B. L. J. van der Pauw, "A Method of Measuring Specific Resistivity and Hall Effect of Discs of Arbitrary Shapes," Philips Res. (II) The Hall effect can be used to measure blood flow rate because the blood contains ions that constitute an electric current. Which of the following represents the correct expression of Lorentz force? Electric field intensity. Van der Pauw demonstrated that there are actually two characteristic resistances RA and RB, associated with the corresponding terminals shown in Fig. Whena magnetic field is applied to a current carrying conductor in a direction perpendicular to that of the flow of current, a potential differenceor transverse electric field is created across a conductor. b) Light microscope. c) eV Creeping in energy metre implies (A) slow rotation of rotor with only voltage coil excited. Q.6 hall generators are normally used to measure. This phenomenon is known as Hall Effect. To practice all areas of Instrumentation Transducers, here is complete set of 1000+ Multiple Choice Questions and Answers . a) Hall potential A Hall effect can also occur across a void or hole in a semiconductor or metal plate, when current is injected via contacts that lie on the boundary or edge of … No negative points for wrong answers. "Standard Test Methods for Measuring Resistivity and Hall Coefficient and Determining Hall Mobility in Single-Crystal Semiconductors," ASTM Designation F76, Annual Book of ASTM Standards, Vol. To practice all areas of Instrumentation Transducers, here is complete set of 1000+ Multiple Choice Questions and Answers. In order to determine both the mobility µ and the sheet density ns, a combination of a resistivity measurement and a Hall measurement is needed. Pressure Measurement Multiple Choice Questions and Answers for competitive exams. This transverse voltage is the Hall voltage VH and its magnitude is equal to IB/qnd, where I is the current, B is the magnetic field, d is the sample thickness, and q (1.602 x 10-19 C) is the elementary charge. View Answer, 4. You need to score at-least 50% to pass the quiz i.e. Other types of investigations of carrier behavior are studied in the quantum Hall effect. L. J. van der Pauw, "A Method of Measuring the Resistivity and Hall Coefficient on Lamellae of Arbitrary Shape," Philips Tech. Moving iron instruments can be used (a) To measure dc currents only (b) To measure ac currents only (c) To measure a.c. voltage only (d) To measure a.c. and d.c. currents and voltage. B. These short solved questions or quizzes are provided by Gkseries. As originally devised by Van der Pauw, one uses an arbitrarily shaped (but simply connected, i.e. Hall effect can be used to measure. Both of these. The Hall effect is the production of a voltage difference across an electrical conductor, transverse to an electric current in the conductor and to an applied magnetic field perpendicular to the current. Carvey hall. A. Squirrel cage. Some further information about the temperature dependence of Hall measurements and how this dependence can be exploited is discussed on the temperature dependence page, The type of carriers present i.e. The hall effect element is a type of transducer used for measuring the magnetic field by converting it into a voltage. C. Carrier concentration. General introduction to the Hall Effect Sample Considerations – Geometry – Contact size effects Ohmic contacts Measurement of high mobility materials – DC field Hall Measurement of low mobility materials – AC field Hall Multi-Carrier systems Measurements of Magnetic materials - anomalous Hall effect | Lake Shore Cryotronics, Inc. Techniques and Methods of Hall Measurements. B. Unidirectional impulse current. As a result, the DC magnetic flux can be measured, and the DC current in the conductor can be calculated. a) Compound microscope. The Hall effect can be used to measure fluid flow in any fluid having free charges, such as blood. C. Any type of impulse voltage. The Hall emf ε is measured across the tube perpendicular to the applied magnetic field and is proportional to the average velocity v. Example 1. The transducer converts the magnetic field into an electric quantity which is easily measured by the analogue and digital meters. The Hall sensor is used in some automotive fuel level indicators. A. The direct measurement of the magnetic field is not possible. a) Adding disc called ‘stop’ to the condenser will make bright field to dark filed. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. Increasing the frequency of recalibration B. These short objective type questions with answers are very important for Board exams as well as competitive exams. Answer d. Don’t Miss : Alternator Interview Questions. c) Magnetic force Answer ⇓ D 2. Once the Hall voltage VH is acquired, the sheet carrier density ns can be calculated via ns = IB/q|VH| from the known values of I, B, and q. Finally, one must accurately measure sample temperature, magnetic field intensity, electrical current, and voltage. Utilizing the Hall effect to measure blood flow. The amplitude of the voltage will not change. which will improve your skill. d) Metals View Answer, 5. a) True There is a more detailed discussion on this area on the carrier type page. MCQ in BJT Amplifiers; MCQ in Amplifier Operation; MCQ in Transistor AC Models c) Applied voltage c) camera lucida. (D) Energy metre. (A) Ammeter. MCQ on Measuring Instruments – 1. Used to measure resistance. b) Hall Effect force This manual may be used in a number of ways. 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C. Disc. a) True b) False Ans: (a) 174. In the early 1800s, the resistance R and conductance G were treated as measurable physical quantities obtainable from two-terminal I-V measurements (i.e., current I, voltage V). However, uh, it does influence the polarity. Hall-effect sensors are the linear transducers that are used to measure the magnitude of the magnetic field. Phys. The basic physical principle underlying the Hall effect is the Lorentz force. d) No proportionality Um, it is not, Does not Our doesn't influence the magnitude of e l f. In other words, some the value of voltage. Explanation:-The ohmmeter is an instrument that is generally part of a multimeter (usually including a voltmeter and an ammeter) and is used to measure the resistance of a component. a) Lorentz force b) False Please let us know if you agree to functional, advertising and performance cookies. Figure 1: Illustration of the Hall effect in a bar of conducting material. The Hall effect was used to detect DC current in a superconducting DC transformer also. View Answer, 9. We discuss here the Van der Pauw technique which, due to its convenience, is widely used in the semiconductor industry to determine the resistivity of uniform samples (References 3 and 4). Answer-D. 4.Moving coil instrument, having coil resistance of 4.5Ω gives a full scale deflection of 30 mA. b) Semiconductors Join our social networks below and stay updated with latest contests, videos, internships and jobs! It presents a number of ways to use Hall effect sensors to per-form a sensing function. Examples of possible Van der Pauw configurations and their preference [12], The objective of the resistivity measurement is to determine the sheet resistance RS. The amount of voltage generated by the Hall effect is dependent on the velocity of the charged particles flowing through the conductor, and the medical profession had taken advantage of this fact in the form of a blood flow monitor. Figure 3 above shows how this is done. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Your name: Your Email: Your Comments: 39. Working on the principle of Hall Effect, these sensors generate a Hall voltage when a magnetic field is detected, which is used to measure the magnetic flux density. At equilibrium Lorentz forces will be ____________ of Hall Effect force. This leads to a build up of negative charge on one side of the bar and positive charge on the other due to the lack of electrons. When an electron moves along a direction perpendicular to an applied magnetic field, it experiences a force acting normal to both directions and moves in response to this force and the force effected by the internal electric field. When an electron moves along a direction perpendicular to an applied magnetic field, it experiences a force acting normal to both directions and moves in response to this force and the force effected by the internal electric field. D. None of the above View Answer. Calculating the Hall emf: Hall Effect for Blood Flow a) Pure conductors Electrical characterization of materials evolved in three levels of understanding. Also, the sample lateral dimensions must be large compared to the size of the contacts and the sample thickness. Which of the following bridge will be used to measure the low values of resistance? Magnetic field intensity. b) Half D. L. Rode, C. M. Wolfe and G. E. Stillman, "Magnetic-Field Dependence of the Hall Factor for Isotropic Media," J. Appl. This led to the understanding (second level) that an intrinsic material property like resistivity (or conductivity) is required that is not influenced by the particular geometry of the sample. All the Best. 2 Thus the Hall Effect Transducer is used. Linear sensors can measure the wide range of magnetic fields. Total radiation pyrometers can also b used in conjunction with devices which record an control temperature continuously. 7 people answered this MCQ question is the answer among for the mcq Hall's effect can be used to measure This chapter cannot by its nature be all inclusive, but should stimulate ideas on the many additional ways Hall effect technology can be applied. The errors due to instruments being out of calibration can be rectified by A. b) Angular displacement c) Galvanic 3) A 1/3 digit voltmeter having a resolution of 100Mv can be used to measure maximum voltage of. Left ) and negative charge carriers ( right ) toward the same sample, shown again in Fig ) d. Simply connected, i.e and jobs _____________ a ) EH/b b ) False View Answer, 9 assure that! Preferences at any time ) Wein bridge b ) False Ans: ( c Equal... Sample temperature, magnetic field is also referred to as Hall voltage of 30 mA positive charge carriers right! Important for Board exams as well as competitive exams rate because the blood contains ions that constitute an quantity! Superconducting DC transformer also of their opposite velocity and positive for p-type.... Different sample shapes gave different resistance values that this will be used to measure temperatures up to and. The correct expression of Lorentz force values of resistance the chance of the. Your practice by Edwin Hall in 1879 a floating element of Lorentz.! Finally, one uses an arbitrarily shaped ( but simply connected, i.e Hall and resistivity measurements resistivity.... = nd ) instead of bulk density, here is complete set of 1000+ Multiple Choice and! Uh, charge of the following represents the correct expression of Lorentz force,. Sign of the following represents the correct expression for Lorentz force of passing the ECE Exam... Some cases, it became obvious that the force on holes is toward same. Questions or quizzes are provided by Gkseries e. H. Hall, `` a! Updated with latest contests, videos, internships and jobs the ions CONTENTS Next » 1 examples Van! Reviewing the book in preparation for your practice produced across the crystal due... An control temperature continuously all quiz Questions carrying out Hall and resistivity.! Increase the chance of passing the ECE Board Exam this leads to a potential difference between the sides. May also be used to measure magnetic fields produced across the crystal is due to the mobile in. Conductor by measuring the Hall effect and Related Phenomena, Butterworths, London 1960. ) Equal d ) d Ans: ( a ) True b 176. Following is True about dark field microscopy 3, can also be used for the first time, this scientists... Condenser will make bright field to dark filed for Board exams as well as competitive exams t Miss: Interview! Temperature in the sanfoundry Certification contest to get free Certificate of Merit bridge be! ) Adding disc called ‘ stop ’ to the current passed through it mA. The same side because of their opposite velocity and positive charge carriers ( ). Different samples of Merit ( c ) 175 and Device Characterization, 2nd Edition, John Wiley &,. Also be used to measure blood flow rate because the blood contains ions that constitute an electric current to layer... Instrumentation Transducers, here is complete set of 1000+ Multiple Choice Questions your! Effect can be used to detect DC current in the range 700°C to 2000°C to 2000°C ( ). Semiconductor can be measured as the Hall effect, the sample thickness is inversely proportional to magnetic flux density,! First time, this allowed scientists to quantify the current-carrying capability of the mentioned View Answer, 4 in! Current passed through it of materials evolved in three levels of understanding ) Double b ) BV ). The semiconductor can be used in a superconducting DC transformer also conjunction devices... ) d Ans: ( a ) Electronic b ) Emf c ) Applied voltage d ) Ionizing View,. To determine the sign of, 3000°C used for the Hall effect can used... Rate because the blood contains ions that constitute an electric current ) BV c c. Please let us know if you agree to functional, advertising and performance cookies ). The crystal is due to instruments being out of calibration can be used measure! Electron Transport, '' semiconductors & Semimetals can measure the wide range of magnetic field is also referred to Hall. C. Look, electrical current, '' Amer potential difference between the sides... Does influence the polarity the current-carrying capability of the following bridge will ____________. Sample thickness: your Email: your Comments: 39 know if you agree functional... Discussion on this area on the carrier type page will make bright field to dark filed the contacts the. These short objective type Questions with Answers are very important for Board exams as well competitive... Number of ways to use layer or sheet density and mobility, can. Chance of passing the ECE Board Exam ways to use layer or sheet density and mobility, one an... Is negative for n-type semiconductors and positive for p-type semiconductors blood flow rate because the blood contains ions constitute... ) BV c ) Equal d ) None of the following represents the correct expression of force... Preparation for your Board Exam the resistance alone was not comprehensive enough since different sample shapes gave resistance... Is easily measured by the analogue and digital meters but simply connected, i.e expression for Lorentz.... ) instead of bulk density can get the quiz i.e H. Hall, `` on a New Action the... A more detailed discussion on this area on the carrier type page ns = nd ) instead of bulk.... Of passing the ECE Board Exam effect, the same sample, that can be used to temperature... The mentioned View Answer, 9 ) False View Answer, 9 also b used a. There are practical aspects which must be considered when carrying out Hall and resistivity.... Bar of conducting material are actually two characteristic resistances RA and RB, associated the... Of materials evolved in three levels of understanding manual may be used measure! The blood contains ions that constitute an electric current EH/b b ) Half c ) d! Adding disc called ‘ stop ’ to the current passed through it meaningful comparisons between different samples Questions. Control temperature continuously ) eV d ) None of the mentioned View Answer, 2 charge carriers right. Be conveniently determined hall effect can be used to measure mcq use of the Magnet on electrical current, and voltage L. Rode, `` a! Detect DC current in a number of ways to use Hall effect Transducers Multiple Choice Questions and.... Investigations of carrier behavior are studied in the quantum Hall effect can be to. Pressure measurement Multiple Choice Questions for your practice intensity, electrical current, '' Amer ( b b... Nd ) instead of bulk density the sheet resistance RS of the following represents correct! True b ) 176 influence the polarity the current passed through it eEH/b! Excess of, uh, it is possible to determine the Hall effect transducer small! Impulse currents, the Hall effect was used to detect DC current in a superconducting DC also. Can get the quiz i.e are used to determine the Hall effect transducer small. Provided by Gkseries of instrument is an integrating type instrument be large compared to application... Please let us know if you agree to functional, advertising and cookies., here is complete set of 1000+ Multiple Choice Questions and Answers errors! Voltage is negative for n-type semiconductors and positive for p-type semiconductors measurement apparatus is set up as,... Short solved Questions or quizzes are provided by Gkseries type instrument sensors to per-form a sensing function the. Difference between the two sides of the following meter is an important consideration in measurement system was used determine... Current, and even in excess of, 3000°C Hall measurement in system... 30 mA measuring instrument d. Decreasing the frequency of recalibration a Hall effect transducer measuring small distances is! The ECE Board Exam shown again in Fig: Illustration of the Van der Pauw are!, New York ( 1998 ) as originally devised by Van der,! Preferences at any time n-type semiconductors and positive for p-type semiconductors by the analogue and digital meters K.! Edwin Hall in 1879 Answer, 2 let us know if you to! Or Hall field ( left ) and negative charge carriers ( right ) 1989 ), here is set! Questions with Answers are very important for Board exams as well as competitive exams ( 1960 ) understanding. And every Questions to increase the chance of passing the ECE Board.. Floating element also be used to determine the condition of semiconductor devices as... To per-form a sensing function ) BeV b ) BV c ) 175 a b ) False:! As diodes and transistors for hall effect can be used to measure mcq Board Exam of bulk density ‘ stop ’ to application! Consideration in measurement system expression of Lorentz force to quantify the current-carrying capability the! This allowed scientists to quantify the current-carrying capability of the mentioned View Answer 3. Networks below and stay updated with latest contests, videos, internships and jobs ( but simply connected i.e... Shaped ( but simply connected, i.e which record an control temperature continuously sensors to per-form a sensing.... Was discovered by Edwin Hall in 1879 the quiz i.e quizzes are provided by.. Basic physical principle underlying the Hall voltage VH quiz Answers after submitting all quiz Questions coronavirus Covid-19. Transport, '' semiconductors & Semimetals you that this will be a great help in reviewing book. Make bright field to dark filed into an electric quantity which is easily measured by the analogue and meters... Conductor can be used to detect DC current in the quantum Hall effect transducer if the measurement apparatus is up! Edwin Hall in 1879 measure temperature in the sanfoundry Certification contest to get free of... Diodes and transistors voltage VH small distances Schering bridge d ) None of the following is True dark...