A steel wire hangs vertically form a fixed pint, supporting a weight of 80N at its lower end the length of wire form the fixed point to the weight is 1.5 m and mass per unit length is 1.53 x 10-3kgm-1. What will be its fundamental frequency
As circular coil has 250 turns and a mean diameter of 20 cm. If carries a current of 5A. What is the strength of the magnetic field at a point on its axis at a distance of 5m from the centre of the coil ?