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The steady speed of the disc is proportional to the power because the braking torque is proportional to

  • A.the speed of the disc
  • B.the square of the speed of the disc
  • C.the flux of the braking magnet alone
  • D.the current in the series magnet

Answer: A

Eddy current braking torque rises in direct proportion to speed. Equating it to a driving torque proportional to power gives a speed proportional to power, so the revolutions counted over a period are proportional to the energy consumed in it.

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