Answer to Question #32748 in Electricity and Magnetism for slim

Question

A tangent galvanometer has a coil of 2 turn of mean radius 7.5cm, which is set with its plane in the magnetic meridian. A current is passed through the coil and produces a deflection of a magnet, pivoted at the centre of the coil, of 450. Calculate the current if the horizontal component of the earth’s flux density is
1.8×10−5Wbm−2