Measurement and Instrumentation
In a moving iron meter, the deflecting torque is proportional to

Squareroot of the measurand
Sine of the measurand
Current through the coil
Square of the current through the coil

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Measurement and Instrumentation
The measurement of a quantity

  is a comparison of an unknown quantity with standard.
 is a comparison of an unknown quantity with known quantity.
 is a comparison of an unknown quantity with another quantity.
 none of these.

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