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

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

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Measurement and Instrumentation
In measurement system, the function of the signal manipulating elements is to

 change the magnitude of the input signal while retaining its identity.
 to perform linear operation like addition and multiplication.
 to perform non liner operation like clipping filtering, chopping and clamping.
 change the quantity under measurement to an analogues signal.

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