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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2010
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Q)

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 revolutions/s. The value of magnetic induction in $Wb/m^2$ at the centre of the ring is –


( A ) $\frac{\mu_0qf}{2\pi R}$
( B ) $\frac{\mu_0q}{2 f R}$
( C ) $\frac{\mu_0qf}{2R}$
( D ) $\frac{\mu_0q}{2\pi f R}$

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