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An electric current I enters and leaves ...

An electric current I enters and leaves a uniform circular wire of radius a through diametrically opposite points. A charged paricle q moving along the axis of the circular wire passes through its centre at speed v. The magnetic force acting on the particle when it passes through the centre has a magnitude

A

`q upsilon (mu_0 i)/(2a)`

B

`q upsilon (mu_0 i)/(2 pi a)`

C

`q upsilon (mu_0 i)/(a)`

D

zero

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