Question

Two infinite parallel conductors carry parallel currents of 10 amp. each. Find the magnitude and direction of the force between the conductors per metre length if the distance between them is 20 cm.

Answer 1

F = 2 x 10-7 ((10 x 10 x 1)/0.2) N = 10-4N

The direction of force will depend on whether the two currents are flowing in the same direction or in the opposite direction. As per , it would be a force of attraction in the first case and that or repulsion in the second case.