Two thin long parallel wires separated by a distance \( b \) are carrying a current \( i \) ampe...

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Two thin long parallel wires separated by a distance \( b \) are carrying a current \( i \) ampere each. The magnitude of the force per unit length exerted by one wire on the other is
(A) \( \frac{\mu_{0} i^{2}}{b^{2}} \)
(B) \( \frac{\mu_{0} i^{2}}{2 \pi b} \)
(C) \( \frac{\mu_{0} i}{2 \pi b} \)
(D) \( \frac{\mu_{0} i}{2 \pi b^{2}} \)
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