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A search coil is used to measure a magnetic field by

  • A.measuring the steady current the field drives round it
  • B.measuring the force the field exerts on it
  • C.observing the change in its resistance in the field
  • D.integrating the emf induced when the flux through it changes

Answer: D

Withdrawing the coil from the field, or reversing it, produces a pulse of emf whose time integral is the change of flux linkage. A ballistic galvanometer or an electronic integrator measures that integral, from which the flux density follows given the coil's area and turns.

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