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Assertion: an emf appears in a stationary loop threaded by a changing flux. Reason: the charges in the loop experience a magnetic force because of their motion.

  • A.the assertion is true but the reason given for it is false
  • B.both the assertion and the reason are true and the reason explains the assertion
  • C.both the assertion and the reason are true but the reason does not explain the assertion
  • D.the assertion is false although the reason offered is a true statement in itself

Answer: A

Nothing is moving, so the magnetic part of the Lorentz force plays no part; the driving agent is the induced electric field that a changing magnetic field creates. The reason describes the motional emf, which is the other and quite distinct mechanism.

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