Electric current i enters and leaves a s...

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

`qv(mu_(0)i)/(2a)`

`qv(mu_(0)i)/(2pia)`

`qv(mu_(0)i)/a`

zero

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