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The two fluxes acting on the disc of an induction meter are displaced in space as well as in time because

  • A.the two magnets cannot physically occupy the same position on the disc
  • B.the eddy currents would cancel if the two fluxes acted at the same point
  • C.a torque requires both a phase and a position difference
  • D.the disc would otherwise be pulled out of its bearings by the attraction

Answer: C

The torque comes from the flux of one magnet acting on the eddy currents produced by the other, and that requires the current of one to flow through the field of the other. Coincident fluxes, however displaced in phase, would produce no net rotation.

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