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 9 of 15
- A. Insulation should be perfect
- B. Resistance of both should be least
- C. Core should be laminated
- D. All of above
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Correct answer: All of above- A. Commutators
- B. Transformer
- C. D.C motor
- D. Thermistors
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Correct answer: Transformer- A. Option A
- B. Option B
- C. Option C
- D. Option D
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Correct answer: Option A164. The turn ratio of setup transformer is the voltage ratio and current ratio respectively will be:
- A. 25, 50
- B. 50, 0.02
- C. 0.02, 50
- D. 50 volt, 0.02 A
Explanation: Explanation for this question will be added soon!
Correct answer: 50, 0.02- A. Eddy currents
- B. Magnetic field
- C. Hysteresis loss
- D. Both A & C
Explanation: The explanation is: There are two main causes of power loss in the transformer: i) Eddy currents Eddy currents are circulating currents…
Correct answer: Both A & C- A. pin=pout
- B. pin<pout
- C. Pin>Pout
- D. Pm .Pout
Explanation: For an ideal transformer, the principle of power conservation is paramount, which states that the power input (Pin) equals the power…
Correct answer: pin=pout- A. Primary are more
- B. Primary are less
- C. Primary and secondary are equal
- D. None of these
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Correct answer: Primary are more- A. A.C only
- B. D.C only
- C. High voltage only
- D. Both A.C and D.C
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Correct answer: A.C only- A. Soft iron
- B. Copper
- C. Nickel
- D. Aluminum
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Correct answer: Nickel- A. 3 volt
- B. 0.3 volt
- C. 1.5 volt
- D. 0.2 volt
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Correct answer: 3 volt- A. 1:20
- B. 1:40
- C. 20:1
- D. 40:1
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Correct answer: 40:1- A. 100 watt
- B. 25 watt
- C. First 25 and then 100watt
- D. None of these
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Correct answer: 25 watt- A. 113volt
- B. 226 volt
- C. 339 volt
- D. 452 volt
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Correct answer: 113volt- A. Zero current
- B. Maximum current
- C. Minimum current
- D. Steady average current
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Correct answer: Steady average current- A. Coil oscillate
- B. Coil rotate
- C. Coil remain at rest
- D. Both (a) (b)
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Correct answer: Coil remain at rest- A. VBL sin θ
- B. -VBL sin θ
- C. Both (a), (b)
- D. Zero
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Correct answer: Zero- A. Maximum
- B. Minimum
- C. Zero
- D. None of these
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Correct answer: Zero- A. Directly
- B. Inversely
- C. Both (a) (b)
- D. None of these
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Correct answer: Inversely- A. Mass
- B. Momentum
- C. Charge
- D. Energy
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Correct answer: Energy180. The phenomenon in which changing current in one coil induces an e.m.f. in another coil is called:
- A. Mutual inductance
- B. Self induction
- C. Mutual induction
- D. All of these
Explanation: Explanation for this question will be added soon!
Correct answer: Mutual induction