MHT CET 2026 Physics question
A thin ring of radius 'R' metre has charge 'q' coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of 'f' revolution/s. The value of magnetic induction at the centre of the ring in Wb/m is ( = permeability of free space)
Answer: (C)
Solution
A rotating charged ring is equivalent to a circular current loop. In one revolution the charge passes any point once, so the equivalent current is (charge per unit time). The field at the centre of a circular loop is \dfrac${μ_0
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