Problem

A galvanometer coil

5 \text{ cm} \times 2 \text{ cm}

with 200 turns is suspended vertically in a field of

5 \times 10^{-2} \text{ T}

. The suspension fibre needs a torque of

0.125 \times 10^{-7} \text{ N-m}

to twist it through one radian. Calculate the strength of the current required to be maintained in the coil if we require a deflection of

6^\circ