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A straight segment \( \mathrm{OC} \) (of length L meter) of a circuit carrying a current I amp is placed along the \( \mathrm{x} \)-axis. Two infinitely ling straight wires \( \mathrm{A} \) and \( B \), each extending form \( \mathrm{z}=-\infty \) to \( +\infty \), are fixed at \( y=- \) a metre and \( \mathrm{y}=+\mathrm{a} \) metre respectively, as shown in the figure. If the wires \( \mathrm{A} \) and \( \mathrm{B} \) each carry a current I amp into plane of the paper. Obtain the expression for the force acting on the segment \( \mathrm{OC} \). What will be the force \( \mathrm{OC} \) if
\( \mathrm{P} \)
W current in the wire \( B \) is reversed?
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