Two parallel wires of length $9\, m$ each are separated by a distance $0.15\, m$. If they carry equal currents in the same direction and exerts a total force of $30 \times 10^{-7} \,N$ on each other, then the value of current must be........$amp$
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(d) $F = {10^{ - 7}} \times \frac{{2{i^2}}}{a} \times l$$ \Rightarrow 30 \times {10^{ - 7}} = {10^{ - 7}} \times \frac{{2{i^2}}}{{0.15}} \times 9$
$ \Rightarrow i = 0.5\,A$
$ \Rightarrow i = 0.5\,A$
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