Free Electromagnetic Induction MCQs with Answers
288 Electromagnetic Induction MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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Read the Electromagnetic Induction notesFree MDCAT chapter notes with key terms288 questions · page 6 of 15
- A. Electric energy to mechanical energy
- B. Mechanical energy to electric energy
- C. Mechanical energy to potential energy
- D. Not enough information
Explanation: An electric motor transforms electrical energy into mechanical energy.Motors consist of loops of wire in a magnetic field.
Correct answer: Electric energy to mechanical energy- A. Magnetic field strength
- B. Number of turns in the coil
- C. Frequency of rotation
- D. All the above
Explanation: The electromotive force (emf) produced by an AC generator depends upon all the above factors:Magnetic field strength: The strength of the…
Correct answer: All the above- A. Electric motor
- B. DC Dynamo
- C. A.C generator
- D. None of above
Explanation: Slip rings are used in A.C. generators.Slip rings are components used to transfer electrical power and signals from a stationary to a…
Correct answer: A.C generator- A. Lesser
- B. Greater
- C. Constant
- D. None of above
Explanation: The product of induced current and resistance is always constant.This statement refers to Ohm's law for electromagnetic induction, which…
Correct answer: Constant- A. Inductor
- B. Resistance
- C. Solenoid
- D. Capacitor
Explanation: Energy can be stored in a magnetic field of an Inductor.Inductors are passive electrical components typically consisting of a coil of wire…
Correct answer: Inductor- A. Faradays law
- B. Lenz law
- C. Ampere's law
- D. None of above
Explanation: The principle of an electric generator is based on Faraday's law.Faraday's law of electromagnetic induction states that a changing…
Correct answer: Faradays law- A. Current
- B. emf
- C. Both (a) and (b)
- D. None of them
Explanation: The Lenz's law refers to induced current.While Lenz's law is sometimes used in conjunction with induced emf (electromotive force), it…
Correct answer: Current- A. Electric field
- B. Magnetic field
- C. Conservative field
- D. Gravitational field
Explanation: An alternating electromotive force (emf) is generated by rotating a coil of wire within a magnetic field.
Correct answer: Magnetic field- A. Flows intermediately
- B. Varies in magnitude
- C. Reverses its direction several times per second
- D. None of the above
Explanation: An alternating current (AC) reverses its direction multiple times within a given period, typically measured in Hertz (Hz).
Correct answer: Reverses its direction several times per second- A. Dynamo
- B. Transformer
- C. Rectifier
- D. Motor
Explanation: An alternating current (AC) is converted into direct current (DC) by a device called a Rectifier.A rectifier is an electrical device that…
Correct answer: Rectifier- A. Commutator
- B. Coil
- C. Carbon brushes
- D. Magnetic field
Explanation: In a DC (direct current) generator, the commutator is a crucial component.
Correct answer: Commutator- A. Steps up D.C voltage
- B. Steps down D.C voltage
- C. Steps up or steps down A.C. voltage
- D. None of above
Explanation: Explanation for this question will be added soon!
Correct answer: Steps up or steps down A.C. voltage- A. A secondary coil
- B. A primary coil
- C. Neither primary nor secondary
- D. Primary coil and secondary coil
Explanation: Explanation for this question will be added soon!
Correct answer: Primary coil and secondary coil- A. Electric motor
- B. A.C generator
- C. Transformer
- D. D.C. generator
Explanation: Explanation for this question will be added soon!
Correct answer: Transformer- A. A.C generator
- B. D.C generator
- C. Electric motor
- D. Transformer
Explanation: Explanation for this question will be added soon!
Correct answer: Transformer- A. William Black
- B. William Smith
- C. William Sturgeon
- D. Mosley
Explanation: Explanation for this question will be added soon!
Correct answer: William Sturgeon- A. 1834
- B. 1820
- C. 1840
- D. 1835
Explanation: Explanation for this question will be added soon!
Correct answer: 1834- A. Elastic P.E
- B. Electrical P.E
- C. Gravitational P.E
- D. Kinetic energy
Explanation: Explanation for this question will be added soon!
Correct answer: Electrical P.E- A. Mass density
- B. Energy density
- C. Charge density
- D. Volume density
Explanation: Explanation for this question will be added soon!
Correct answer: Energy density- A. Alternating current
- B. Direct current
- C. Induced current
- D. None of these
Explanation: Explanation for this question will be added soon!
Correct answer: Alternating current