Two thin long parallel wires separated by a distance \( d \) carry ...

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Two thin long parallel wires separated by a distance \( d \) carry a current of \( I \) ampere in same direction. They will
(a) attract each other with a force of \( \frac{\mu_{0} I^{2}}{2 \pi d} \)
(b) repel each other with a force of \( \frac{\mu_{0} I^{2}}{2 \pi d} \)
(c) attract each other with a force of \( \frac{\mu_{0} I^{2}}{2 \pi d^{2}} \)
(d) repel each other with a force of \( \frac{\mu_{0} I^{2}}{2 \pi d^{2}} \)
\( \mathrm{W} \)
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