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

`qv (mu_0 i)/(2 a)`

`qv (mu_0 i)/(2 pi a)`

`qv (mu_0 i)/(a)`

zero

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