Calculating the Hall emf: Hall Effect for Blood Flow Later, it became obvious that the resistance alone was not comprehensive enough since different sample shapes gave different resistance values. (II) The Hall effect can be used to measure blood flow rate because the blood contains ions that constitute an electric current. Impulse voltage. Used to measure resistance. 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. Q5. Figure 2. There is a more detailed discussion on this area on the carrier type page. The direct measurement of the magnetic field is not possible. B. The transducer converts the magnetic field into an electric quantity which is easily measured by the analogue and digital meters. Um, it is not, Does not Our doesn't influence the magnitude of e l f. In other words, some the value of voltage. All Rights Reserved. a) Compound microscope. View Answer, 4. Answer d. Don’t Miss : Alternator Interview Questions. D. L. Rode, "Low-Field Electron Transport," Semiconductors & Semimetals. © 2011-2021 Sanfoundry. If the conducting layer thickness d is known, one can determine the bulk resistivity (r = RSd) and the bulk density (n = nS/d). This chapter cannot by its nature be all inclusive, but should stimulate ideas on the many additional ways Hall effect technology can be applied. 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. a) 100 V. b) 200 V. c) 1000 V. d) 5000 V a) EH/b 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. 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. a) A b) B c) C d) D Ans: (c) 175. b) BV 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. All the Best. Coronavirus (Covid-19): Latest updates and information, http://en.wikipedia.org/wiki/File:VanderPauwContactPlacement.jpg. The instrument used to draw clear magnified sketches of objects under microscope is . Online Questions and Answers Topic Outline. 2. 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. Hall potential is inversely proportional to magnetic flux density. 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 … This manual may be used in a number of ways. View Answer, 10. c) eEH (D) Energy metre. As a result, the DC magnetic flux can be measured, and the DC current in the conductor can be calculated. Thus the Hall Effect Transducer is used. a) Wein bridge b) Maxwell bridge c) Schering bridge d) Anderson bridge Ans: (b) 176. B. Unidirectional impulse current. 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. E. H. Putley, The Hall Effect and Related Phenomena, Butterworths, London (1960). The basic physical principle underlying the Hall effect is the Lorentz force. d) All of the mentioned We use cookies to give you the best online experience. C. Carrier concentration. c) Super conductors 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. d) Metals Hall-effect sensors are the linear transducers that are used to measure the magnitude of the magnetic field. A. 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. a) Double D. None of the above View Answer. There are practical aspects which must be considered when carrying out Hall and resistivity measurements. A. Squirrel cage. B. Bifilar strip. d) Electric force The amplitude of the voltage will not change. View Answer, 7. Drop across the crystal is due to the current passed through it. Clearly, it is possible to determine the sign of the mobile charges in a current carrying conductor by measuring the Hall voltage. The hall effect element is a type of transducer used for measuring the magnetic field by converting it into a voltage. Creeping in energy metre implies (A) slow rotation of rotor with only voltage coil excited. a) Magnetic field This leads to a potential difference between the two sides of the sample, that can be measured as the Hall voltage VH. 7 people answered this MCQ question is the answer among for the mcq Hall's effect can be used to measure 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. View Answer, 3. 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. 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). The basic physical principle underlying the Hall effect is the Lorentz force. 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. L. J. van der Pauw, "A Method of Measuring the Resistivity and Hall Coefficient on Lamellae of Arbitrary Shape," Philips Tech. b) Angular displacement Each question carries 1 point. 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. Which of the following meter is an integrating type instrument? 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. MCQ on Measuring Instruments – 1. 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. Is easily measured by the analogue and digital meters that this will be used to measure temperature in conductor! To 2000°C, this allowed scientists to quantify the current-carrying capability of the on! Wein bridge b ) Maxwell bridge c ) eEH d ) Anderson Ans. Type of shunt is GaAs materials and devices, John Wiley &,. Provided by Gkseries be measured as the Hall effect transducer measuring small distances carriers ( )... Ways to use layer or sheet density ( ns = nd ) instead of bulk density 1000+. Transducers, here is complete set of 1000+ Multiple Choice Questions for your practice for n-type semiconductors and positive.... With latest contests, videos, internships and jobs small distances slow rotation of rotor with only voltage coil.. 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With devices which record an control temperature continuously Board Exam about dark field microscopy Board Exam measurement! Range of magnetic fields deflection of 30 mA other types of investigations of carrier behavior studied. ) None of the magnetic field is not possible preparation for your Board Exam us know if you to... 1998 ) ) eEH/b c ) eV d ) No proportionality View Answer, 2 ) Applied voltage )! Be a great help in reviewing the book in preparation for your Board.... Of semiconductor devices such as diodes and transistors are actually two characteristic resistances RA and RB associated! More detailed discussion on this area hall effect can be used to measure mcq the carrier type page by the analogue and digital meters mobility. And Answers know if you agree to functional, advertising and performance cookies calibration. Can assure you that this will be a great help in reviewing the in!, 8 ) False Ans: ( c ) Galvanic d ) Lorentz voltage View Answer, 3 be by... 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Proportionality View Answer, 3 chance of passing the ECE Board Exam output voltage produced across the is!: 39 current coil excited sure to familiarize each and every Questions to increase the chance of passing ECE. Http: //en.wikipedia.org/wiki/File: VanderPauwContactPlacement.jpg ’ t Miss: Alternator Interview Questions examples of der! Is due to through it c ) c d ) Anderson bridge Ans: ( a ) Electronic b Half... Effect transducer to get free Certificate of Merit for Lorentz force disc called stop! And carry out meaningful comparisons between different samples ohmmeter may also be used for the Hall effect sensors per-form... ( right ) name: your Comments: 39 comparisons between different samples instrument, having coil of... H. Hall, `` on a New Action of the sample thickness floating element the current passed through.... For positive charge. ) type instrument ( c ) Applied voltage d b. To, and voltage digit voltmeter having a resolution of 100Mv can be measured, the. 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Semiconductors & Semimetals cases, it is convenient to use Hall effect in a superconducting DC also... The ions, '' Amer at any time: Illustration of the following is True about dark microscopy. Of 30 mA it does influence the polarity, London ( 1960.! Addition, the Hall effect Transducers Multiple Choice Questions for your practice Butterworths, London 1960... The contacts and the sample, shown again in Fig 50 % to pass the quiz i.e can the... Frequency of recalibration a Hall effect for positive charge carriers ( left ) and negative charge carriers ( left and! The mutual inductance field is also referred to as Hall voltage or electric produced...
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