Measurement and Instrumentation
In figure Z1 = 200∠60° ohm. Z2 = 400∠-90° ohm, Z3 = 300∠0° ohm. Then Z4 for bridge to be balanced is

 400∠-90° ohm.
 150∠30° ohm.
 600∠-150° ohm.
 300∠90° ohm.

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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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