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A rectangular coil of a moving coil galv...

A rectangular coil of a moving coil galvanometer contains 100 turns, each having area `15 cm^(2)`. It is suspended in the radial magnetic field 0.03 T. The twist constant of suspension fibre is `15xx10^(-10)` N-m/degree. Calculate the sensitivity of the moving coil galvanometer.

Text Solution

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Data: `N=100, A=15 cm^(2) = 15 xx 10^(-4) m^(2), B=0.03 Wb//m^(2),C=1.5 xx 10^(-4)m^(2), B=0.03 Wb//m^(2), C=1.5 xx 10^(-9) N.m`/degree
The current sensitivity,
`S_(1)=(NAB)/C = (100 xx 15 xx 10^(-4) xx 0.03)/(1.5 xx 10^(-9))`
`=3 xx 10^(6)` degrees/A = 3 degrees/ `mu`A
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