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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 particle carrying a charge q moves along the axis of the circular wire with speed v. What is the magnetic force experienced by the particle when it passes through the centre of the circle ?

A

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

B

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

C

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

D

Zero

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