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Creeping is prevented by

  • A.increasing the strength of the braking magnet until the disc cannot move
  • B.reducing the number of turns on the pressure coil of the meter
  • C.fitting a light spring which holds the disc until the load current appears
  • D.drilling two diametrically opposite holes in the disc

Answer: D

As a hole approaches the shunt magnet pole the eddy current pattern is distorted and a torque arises that holds the disc there. Any creeping motion therefore stops within half a revolution, while at normal speeds the effect is negligible.

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