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NEET 2015 (AIPMT, Cancelled Paper) · Biot-Savart Law & Circular Coils

Biot-Savart Law & Circular Coils question from NEET 2015 (AIPMT, Cancelled Paper)

Q94NEET 2015 · AIPMT · CANCELLED PAPEREasy

Biot-Savart Law & Circular Coils

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

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Answer: (b)

Equivalent current $I = ne$ (charge passing a point per second).
$B = \frac{\mu_0 I}{2r} = \frac{\mu_0 n e}{2r}$
So the answer is (b).

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