Measurement and Instrumentation
To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken

Any of the above
From the same source as the unknown voltage
From a battery
From a source which is not the same as the unknown voltage

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Measurement and Instrumentation
A Manganin swap resistance is connected in series with a moving coil ammeter consisting of a milli ammeter and a suitable shunt in order to

 Reduce the size of the meter.
  Minimize the effect of temperature variation.
 Minimize the effect of stray magnetic fields.
 Obtaine large deflecting torque.

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