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MHT CET 2021 (23 Sep, Shift 1) · Biot-Savart Law & Circular Coils

Biot-Savart Law & Circular Coils question from MHT CET 2021 (23 Sep, Shift 1)

Q77MHT CET 2021 · 23 SEP · SHIFT 1Medium

Biot-Savart Law & Circular Coils

A thin ring of radius ' $R$ ' meter has charge ' $q$ ' coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of $f$ revolution/s. The value of magnetic induction in $\text{Wb m}^{-2}$ at the center of the ring is ( $\mu_0 =$ Permeability of free space)

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Answer: (c)

Rotating charged ring: $I = qf$ .
$B = \frac{\mu_0 I}{2R} = \frac{\mu_0 q f}{2R}$
So the answer is (c) $\frac{\mu_0 q f}{2R}$ .

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