​​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/m2 at the centre of the ring is?

Dear Student ,
Here in this case as we know that , the current i will be equal to the product of q and f .
So , I = qf .
Therefore the magnitude of the magnetic induction at the centre of the ring is ,B=μ0I2R=μ0qf2R
Hope this helps you .

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