An electric current I enters and leaves a uniform circular wire of radius r through diametrically opposite points. A charged particle q moves along the axis of circular wire passes through its centre at speed v. The magnetic force on the particle when it passes through the centre has a magnitude.
- A$${{qv{\mu _0}I} \over {2\pi r}}$$
- B$$qv{{{\mu _0}I} \over {\pi r}}$$
- C$${{qv{\mu _0}I} \over r}$$
- D0
✓ Correct answer: D
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