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Q.

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 centre of the ring is :

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a

μ0q2πfR

b

μ0qf2πR

c

μ0qf2R

d

μ0q2fR

answer is C.

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B=μ0i2r=μ02rqT=μ0qf2r
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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 centre of the ring is :