Measurement and Instrumentation
A bridge circuit is shown in the figure below. Which one of the sentence given below is most suitable for balancing the bridge?

 First adjust R2 and then adjust R3.
 First adjust R4 and then adjust R2.
 First adjust R4 and then adjust R1.
 First adjust R2 and then adjust R4.

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

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