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The single-phase energy meter in domestic use works on the

  • A.induction principle
  • B.electrodynamometer principle
  • C.electrostatic principle
  • D.thermal principle

Answer: A

Two alternating fluxes induce eddy currents in an aluminium disc, and the interaction of each flux with the currents due to the other produces a steady torque. The disc therefore rotates continuously, which is what an integrating instrument needs.

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