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A straight segment OC (of length L meter) a circuit carrying a current I amp is placed along the x-axis. Two infinitely long straight wires A and B, each extending from z = ∞ to -∞ , are fixed at y = -a metre and y = +a metre respectively, as shown in figure. 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 on OC if the current in the wire B is reversed ? 

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If current in wire B is reversed, then net magnetic field will be along +ve x-axis i.e along the current carrying segment OC. Hence, force on the segment OC will be zero in that case.

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