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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
μon2er
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B
μone2r
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C
μone2πr
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D
Zero
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Solution

The correct option is B μone2r
Magnetic field at center of circular coil is given as B=μI2r where I is current in coil.
time taken in n revolution is 1 sec, time taken in 1 rev=1n
I=qt=e1n
B=μne2r
hence, correct answer is option B.

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