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Faraday's law applied to a coil of \( N \) turns links the flux

  • A.once, the turns sharing the same flux
  • B.N squared times, each turn linking every other
  • C.once for the first turn and not at all for the rest
  • D.N times, so the emf is N times the single-turn value

Answer: D

Each turn separately encircles the flux, so the flux linkage is N times the flux and the emf is N times that of a single turn. It is the same reason the inductance of a coil goes as the square of the turns, one factor for producing the flux and one for linking it.

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