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A voltmeter reading across two points of a loop threaded by changing flux depends on

  • A.the resistance of the voltmeter alone
  • B.the frequency but not the geometry of the leads
  • C.the path the voltmeter leads take
  • D.nothing but the two points themselves

Answer: C

Because the electric field is not conservative, the line integral between two points differs from path to path, and the voltmeter leads form part of a loop that may itself link some of the flux. This is a genuine and much-discussed pitfall in measuring around inductive circuits.

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