Measurement and Instrumentation
The internal resistance of a milli-ammeter must be very low for

 high sensitivity.
 high precision.
 minimum effect on the current in the circuit.
 high accuracy.

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

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