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

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

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Measurement and Instrumentation
In AC circuits, the connection of measuring instruments cause loading effect errors which may effect

 only phase of the quantity being measured.
 magnitude, phase and waveform of the quantity being measured.
 both of above.
 only the magnitude of the quantity being measured.

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