AP EAMCET Engineering 2013 Solved Paper

A deflection magnetometer is adjusted and a magnet of magnetic moment M is placed on it in the usual manner and the observed deflection is θ. The period of oscillation of the needle before settling of the deflection is T. When the magnet is removed, the period of oscillation of the needle is T0 before settling to 0°−0°. If the earth's induced magnetic field is BH , the relation between T and T0 is