A moving coil galvanometer has 100 turns...

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.

`44 xx 10^-7` `"Nmdeg"^(-1)`

`4 xx 10^-5` `"Nmdeg"^(-1)`

`0.4 xx 10^-5` `"Nmdeg"^(-1)`

`40 xx 10^-5` `"Nmdeg"^(-1)`

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