Determine the control constant of the spring

Posted on 2014-02-21 14:07:00 in Physics by SAUTY'S

A moving coil milli-voltmeter has a resistance of 20 ? and full scale-deflection of 120^o is reached when a p.d. of 100mV is applied across its terminals. The moving coil has the effective dimensions of 3.1 cm x 2.6 cm and is wound with 120 turns. The flux density in the gap is 0.15 T. Determine the control constant of the spring and suitable diameter of copper wire for coil winding if 55% of total instrument resistance is due to coil winding p for copper = 1.73 x 10^-6 ?-cm.

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