Two long and parallel wires are at a distance of $0.1\, m$ and a current of $5\, A$ is flowing in each of these wires. The force per unit length due to these wires will be
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(a) $F = \frac{{{\mu _0}}}{{4\pi }}\frac{{2 \times {i_1}{i_2}}}{a} = \frac{{{{10}^{ - 7}} \times 2 \times 5 \times 5}}{{0.1}} = 5 \times {10^{ - 5}}N/m$
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