Two thin, long, parallel wires, separated by a distance \( d \) carry a current of \( i \) amper...

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Two thin, long, parallel wires, separated by a distance \( d \) carry a current of \( i \) ampere in the same direction. They will
(A) Attract each other with a force of \( \mu_{0} i^{2} /\left(2 \pi d^{2}\right) \)
(B) Repel each other with a force of \( \mu_{0} i^{2} /\left(2 \pi d^{2}\right) \)
(C) Attract each other with a force of \( \mu_{0} i^{2} /(2 \pi d) \)
(D) Repel each other with a force of \( \mu_{0} i^{2} /(2 \pi d) \)
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