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True or false: the electric field in a time-varying situation is conservative.

  • A.True, the electric field always being derivable from a potential
  • B.True, provided the magnetic field is uniform
  • C.True, if the frequency is low enough
  • D.False, the curl of the field equalling minus the rate of change of flux density

Answer: D

A changing magnetic field gives the electric field a curl, so the line integral round a closed path is not zero and the field does net work round a loop. That is exactly the induced emf, and it is why a scalar potential alone will not do.

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