A straight segment OC (of length L meter) of a circuit carrying a current I amp is placed along the x-axis. Two infinitely line straight wires A and B, each extending from z = -∞ to +∞ to , are fixed by y=−a meter and y=+a meter respectively, as shown in the Fig. 21.122. If the wires A and B each carry a current I amp into plane of the paper. Obtain the expression for the force acting on the segment OC. What will be the force OC if current in the wire B is reversed?
