Measurement and Instrumentation
When using ohmmeter, applied voltage is to be disconnected from the circuit because

The ohmmeter has its own internal battery
Voltage source will increase resistance
Current will decrease resistance
None of these

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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

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

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