Aflat coil of wire consists of 500 turns each 4 cm in diameter. if a current of 5
amperes flows in the coil, calculate: -
(a) the magnetic moment of the coil;
(b) the magnetostatic potential at a point 50 cm from the coil along its axis in a
direction related by a right-hand screw to the sense of current circulation;
(c) the magnetostatic potential at a point in the plane of the coil 5 metres away;
(d) the torque experienced by the coil if placed with its axis making an angle of 60° to a field of a magnetic induction of 2 tesla;
(e) the force acting on the coil due to an identical coil arranged coaxially one metre away, carrying the same current.