A moving coil galvanometer has 100 turns and each turn has an area `2.0 cm^2`. The magnetic field produced by the magnet is `0.01 T`. The deflection in the coil is `0.05` radian when a current of `10 mA` is passed through it. Find the torsional constant of the suspension wire.
Text Solution
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We have `I = (K)/(NAB) = theta` `implies K = (NABi)/(theta)` or `K = (100 xx 2 xx 10^(-4) xx 0.01 xx 10 xx 10^(-3))/(0.05)` or `K = 4.0 xx 10^(-5)` N-m/radian
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