Magnetic field due to currentHard

Question

A thin ring of radius R meter has charge q coulomb uniformaly spRead on it. The ring rotates about its axix with a constant frequency of f revolutions/s. The value of magnetic induction in Wb/m2 at the centre of the ring is

Options

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Solution

Current produced due to circular motion of charge q is
       I = q f         ...... (i)
Magnetic field induction at the centre of the ring of radius R is

        [Using (i)]

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