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A transformer electromotive force arises when

  • A.the resistance of a circuit changes while the flux is constant
  • B.the flux linking a stationary circuit changes with time
  • C.a conductor is moved across a steady magnetic field
  • D.a conductor is rotated in a uniform field at constant speed

Answer: B

Nothing moves, and the changing flux gives the electric field a curl which drives the current. The two mechanisms, motional and transformer, together account for the whole of the emf in any general case, and Faraday's law covers both.

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