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
A.

B.

C.

D.

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)]
I = q f ...... (i)
Magnetic field induction at the centre of the ring of radius R is

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