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A clamp meter measures current without breaking the circuit by responding to

  • A.the capacitance between the conductor and the jaws
  • B.the magnetic field round the conductor
  • C.the voltage drop along a length of the conductor
  • D.the heating of the conductor under load

Answer: B

The split core encircles the conductor and behaves as a current transformer, or carries a Hall element for direct current. Being able to measure a live feeder without shutting the plant down is what makes it the auditor's first instrument.

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