The control springs of a moving coil instrument provide a resisting torque of 12 x 10
[tex]10 ^ - 6[/tex]
Nm per degree. Calculate the torque exerted when the coil deflects through 75º. If the coil has effective dimensions 40 mm x 15 mm, is wound with 400 turns, and the deflection of 45° occurs when a current of 5 mA passes through the coil, calculate the strength of radial magnetic field in which the coil lies.
