An electric current i enters and leaves a uniform circular wire of rad – InterviewSolution

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1.	An electric current i enters and leaves a uniform circular wire of radius a through diametrically opposite points. A charged particle 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) qv(μ0i/2a)(b) qv(μ0i/2πa)(c) qv(μ0i/a)(d) zero.
Answer» The correct answer is (d) zero.

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