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Magnetism And Matter — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsMagnetism And Matter1 Mark
MCQ
Lenz's law is a direct consequence of:
  • A
    The law of conservation of momentum.
  • B
    The law of conservation of charge.
  • C
    The law of conservation of energy.
  • D
    The law of conservation of emf.
✓

Answer

  1. The law of conservation of energy.

Explanation:

Lenz's law states that the current induced in a circuit due to a change or a motion in a magnetic field is so directed as to oppose the change in flux.

We know that induced EMF produces a current that opposes the change in flux, because a change in flux means a change in energy.Energy can enter or leave, but not instantaneously. So, Lenz' law is a consequence of the law of conservation of energy.

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