Through two parallel wires $A$ and $B$, $10$ and $2$ $ampere$ of currents are passed respectively in opposite direction. If the wire $A$ is infinitely long and the length of the wire $B$ is $ 2\, m$, the force on the conductor $B$, which is situated at $10\, cm$ distance from $A$ will be
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(a) $F = \frac{{{\mu _0}}}{{4\pi }}.\frac{{2{i_1}{i_2}}}{a} \times l$$ \Rightarrow F = {10^{ - 7}} \times \frac{{2 \times 10 \times 2}}{{(10 \times {{10}^{ - 2}})}} \times 2 = 8 \times {10^{ - 5}}\,N$
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