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A Rogowski coil measures current by responding to

  • A.the rate of change of the magnetic field encircling the conductor
  • B.the steady magnetic field of the conductor directly
  • C.the voltage drop along the conductor
  • D.the heating effect of the current in a shunt

Answer: A

A helical winding closed round the conductor links the flux of its field, and the induced voltage is proportional to the rate of change of the enclosed current. Integrating it recovers the current waveform, and because there is no iron the device never saturates.

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