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

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

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

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

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