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A motional electromotive force arises when

  • A.a conductor moves through a steady magnetic field
  • B.the current in a stationary conductor changes with time
  • C.the flux density in a stationary circuit changes with time
  • D.two stationary circuits are coupled by a common core

Answer: A

The charges in the moving conductor experience the Lorentz force and are driven along it, giving an emf equal to the line integral of \( \mathbf{v} \times \mathbf{B} \). It is the principle of every generator, and the transformer emf is the complementary case.

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