A long wire A carries a current of $10\, amp$. Another long wire $B$, Which is parallel to $A$ and separated by $0.1\,m$ from $A$, carries a current of $5\, amp$, in the opposite direction to that in $A$. what is the magnitude and nature of the force experienced per unit length of $B$ $({\mu _0} = 4\pi \times {10^{ - 7}}\,weber/amp{\rm{ - }}m)$
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(a) $F = \frac{{{\mu _0}}}{{4\pi }}\frac{{2{i_1}{i_2}}}{r} = {10^{ - 7}} \times \frac{{2 \times 10 \times 5}}{{0.1}} = {10^{ - 4}}\,N$ (Repulsive)
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