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

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

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Measurement and Instrumentation
Assertion (A) : Precision is a necessary prerequisiteof accuracy. Reason (R) : Precision guarantees accuracy.

 Both A and R are true and R is the correct explanation of A
 A is false bur R is true
 A is true but R is false
 Both A and R are true but R is NOT the correct explanation of A

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