Verified Solution • 2025–26 Session moderate

QAIPM-2011-Ph-1827: NEET 2011 Physics - Class 12 AIPM-2011-Ph-1827 Solution: Charge q is uniformly spread on a thin ring of radius R. The…

Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency f Hz. The magnitude of magnetic induction at the center of the ring is

Multiple Choice Options

A $\frac{\mu_0 qf}{2\pi R}$
B $\frac{\mu_0 qf}{2R}$
C $\frac{\mu_0 q}{2fR}$
D $\frac{\mu_0 q}{2\pi fR}$

Step-by-Step Verified Solution

When the ring rotates about its axis with a uniform frequency f Hz, the current flowing in the ring is I = q T = qf Magnetic field at the centre of the ring is B = _ 0 I 2 R = _ 0 q f 2 R

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