NCERT/Class 12/Physics/Electromagnetic Induction

Electromagnetic Induction

Class 12 · Physics

61 questions22 easy27 medium12 hard

Sample Questions

Q1.The rate of change of magnetic flux in a circuit is 50 Wb/s. The induced EMF in the circuit (with no self-inductance effects considered) is:

  • A50 V
  • B25 V
  • C100 V
  • D0.02 V

Q2.The efficiency of a real transformer is less than 100% because of:

  • AResistance of primary coil only
  • BEddy current losses, hysteresis losses, copper (I²R) losses, and flux leakage
  • CMagnetic field losses
  • DPrimary-secondary coupling factor only

Q3.The coefficient of mutual inductance between two coils depends on:

  • ACurrent in the coils
  • BRelative position, orientation, and geometry of the two coils
  • CVoltage applied
  • DFrequency of current

Q4.Self-induction is analogous to which mechanical concept?

  • AFriction
  • BElasticity
  • CInertia
  • DGravity

Q5.An inductor and resistor are in series. At steady state DC, the inductor acts as:

  • AOpen circuit
  • BShort circuit (just a wire)
  • CA capacitor
  • DA resistance equal to L/R

Q6.This is a sample question to preview what you'll get in the full practice test...

  • A. Option one
  • B. Option two
  • C. Option three
  • D. Option four
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Concepts Covered

AC generatorEddy currentsEnergy stored in inductorFaraday's law of inductionInduced EMFLenz's lawMagnetic fluxMotional EMFMutual inductanceSelf-inductanceTransformer basics

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