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 11 of 15
- A. Increase
- B. Remain same
- C. Decrease
- D. Increase exponentially
Explanation: The explanation is given below: If we change the resistance of the loop keeping the speed same, then the product of "I" and "R" remains…
Correct answer: Remain same- A. 0.25V
- B. 2.5V
- C. 0.025V
- D. 25V
Explanation: The induced EMF (E) in a moving conductor within a magnetic field is calculated using the formula: E = B * l * v * sin(θ), where:B is the…
Correct answer: 0.25V- A. I only
- B. III only
- C. I, II, III
- D. I and II only
Explanation: The induced current and induced emf can be increased by: I. Using a strong magnetic field. II. Moving the loop faster. III.
Correct answer: I, II, III- A. AC generator
- B. DC generator
- C. Battery
- D. Transformer
Explanation: Option A: AC generator generates electrical power through the principles of electromagnetic induction, but it does not involve mutual…
Correct answer: Transformer- A. Mutual inductance
- B. Self-induction
- C. Motional emf
- D. None of these
Explanation: Correct option is A. Principle of transformer is Mutual Induction. When a transformer primary has alternating current flowing in the…
Correct answer: Mutual inductance- A. AC generator
- B. Radio choke
- C. DC generator
- D. Transformer
Explanation: Mutual inductance is where the magnetic field generated by a coil of wire induces a voltage in an adjacent coil of wire.
Correct answer: Transformer- A. Weber
- B. Gauss
- C. Tesla
- D. Maxwell
Explanation: The tesla (symbol: T) is a derived unit of the magnetic B-field strength (also called magnetic flux density) in the International System…
Correct answer: Tesla- A. Electromagnetic friction
- B. Electromotive force
- C. Electromagnetic function
- D. None of these
Explanation: Option A : EMF doesn't stand for electromagnetic friction. Option: B According to Faraday's law, EMF stands for electromotive force.
Correct answer: Electromotive force- A. Max. magnetic flux
- B. Rate of change of magnetic flux
- C. Change in magnetic flux
- D. Initial flux
Explanation: Faraday's law of induction (to distinguish it from his laws of electrolysis), states that the magnitude of the emf induced in a circuit is…
Correct answer: Rate of change of magnetic flux- A. Electric field
- B. Magnetic field
- C. Battery
- D. None of these
Explanation: Faraday's law is one of the fundamental principles of electromagnetism.
Correct answer: Magnetic field- A. Equal to that due to gravity
- B. Less than that due to gravity
- C. More than that due to gravity
- D. Depends on the diameter of the ring and the length of the magnet
Explanation: The explanation is: When a bar magnet is dropped through a copper ring with its length along the axis of the ring, it induces eddy…
Correct answer: Less than that due to gravity- A. Zero
- B. Clockwise
- C. Counter clockwise
- D. Along the direction of the fall
Explanation: As the metallic ring falls towards the bar magnet, it experiences a change in magnetic flux, which induces a current in the ring.
Correct answer: Clockwise- A. Essentially zero
- B. About 12 A
- C. About 120 A
- D. Depends on the actual number of turns in the primary coil
Explanation: The explanation is: Vsls = 0 So, the input power must be zero or very small. Thus, a very small current (Ip) flows in the primary coil.
Correct answer: Essentially zero- A. Thickness of the wire of the coil
- B. The time in which magnet is introduced
- C. The strength of the magnetic field
- D. Number of turns of the coil
Explanation: The time in which a magnet is introduced into a coil does not affect the induced voltage.
Correct answer: The time in which magnet is introduced- A. Area of the coil
- B. No. of turns of coil
- C. Resistance of the coil
- D. Length of coil
Explanation: Induced emf does not depend upon the resistance or circuit. It depends upon the time rate of change of magnetic flux.
Correct answer: Resistance of the coil- A. Disregard
- B. Penchant
- C. Abhorrence
- D. Empathy
Explanation: To have a "penchant" for something means to have a fondness for it. A fondness for history would be practical or helpful for future…
Correct answer: Penchant- A. when
- B. a little
- C. my mother
- D. a certain
Explanation: The error in the sentence is in option (C) "my mother," which should be corrected to "our mother" for grammatical accuracy and clarity.
Correct answer: my mother- A. Aesthetic ... Enthralled
- B. Acerbic ... Fascinated
- C. Pictorial ... Dissatisfied
- D. Implicit ... Disenchanted
Explanation: Because the sentence indicates that Azhar "loves roses," the word that best fits in the first blank should have a positive connotation.
Correct answer: Aesthetic ... Enthralled- A. The accident caused a traffic chaos for motorists on Multan Road until the seven-ton truck was removed at around 8 am.
- B. The accident caused traffic chaos for motorists along Multan Road until the seven-ton truck was removed at around 8 am.
- C. An accident caused traffic chaos for motorists along Multan Road until the seven-ton truck was removed on around 8 am.
- D. Accident caused traffic chaos for motorists along Multan Road until the seven-ton truck was removed at around 8 am.
Explanation: The correct answer is B. The accident caused traffic chaos for motorists along Multan Road until the seven-ton truck was removed at around…
Correct answer: The accident caused traffic chaos for motorists along Multan Road until the seven-ton truck was removed at around 8 am.- A. I don't know anything about the speaker; I have just learnt that a Mr. Bill is coming to present a paper.
- B. I don't know anything about the speaker; I have just learnt that the Mr. Bill is coming to present his paper.
- C. I don't know anything about the speaker; I have just learnt that a Mr. Bill is coming to present paper.
- D. I don't know anything about speaker; I have just learnt that Mr. Bill is coming to present his Paper.
Explanation: The sentence is structured correctly, using the phrases "a Mr. Bill" and "a paper" to convey the unknown identity of the speaker and the…
Correct answer: I don't know anything about the speaker; I have just learnt that a Mr. Bill is coming to present a paper.