Electric current i enters and leaves a square loop made of homogene...

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Electric current i enters and leaves a square loop made of homogeneous wire of uniform cross-section through diagonally opposite corners. A charge particle q moving along the axis of the square loop. Passes through centre at speed \( v \). The magnetic force acting on the particle when it passes through the centre has a magnitude
(A) \( q v \frac{\mu_{0} i}{2 a} \)
(B) \( q v \frac{\mu_{0} i}{2 \pi a} \)
(C) \( q v \frac{\mu_{0} i}{a} \)
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