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Current Loop Is a Magnet?

An electron m...

Question

An electron moving in a circular orbit of radius r makes n rotations per second.The magnetic field produced at the centre has magnitude:

A

(μ₀ne/2r)

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B

(μ₀ne/2 πr)

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C

Zero

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D

(μ₀n²e/r)

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Solution

The correct option is A
(μ₀ne/2r)

At the centre of a circular current

$B = \frac{μ_{0} i}{2 r}$

have current i = ne

$∴ B = \frac{μ_{0} n e}{2 r}$

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