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In a moving coil instrument, the deflecting torque is proportional to

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In a moving coil instrument, the deflecting torque is proportional to
  • ACurrent
  • BSquare of the current
  • CSquare root of the current
  • Dsine of the measurand
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In moving coil instruments, deflecting torque is given by

Td = NBAI

Here, N = number of turns

B = Magnetic flux density

A = Area of cross section

I = current

So, the deflecting torque is proportional to current.