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A moving coil instrument develops a torque proportional to the current because

  • A.the controlling spring is nonlinear in its deflection
  • B.the coil area changes as the movement deflects
  • C.the radial field makes the torque independent of the coil position
  • D.the flux density in the gap varies with the coil position

Answer: C

The cylindrical pole faces and soft iron core produce a field that is radial everywhere the coil travels, so the angle between the conductors and the field stays at ninety degrees. The torque is then simply proportional to current, which is what makes the scale uniform.

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