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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.Acharge particle q moving along the axis of the square loop.Passes "],[" through centre at speed "0." The magnetic force acting on the particle when it passes through the centre has "],[" a magnitude "],[[" (A) "qv(mu_(0))/(2a)," (B) "qv(mu_(0)l)/(2 pi a)," (C) "qv(mu_(0)l)/(a)," (D) zero "]]

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