PYQ Vault
EbooksTutor

Thin charged ring rotating about its axis: field at the centre and charge

The same question, asked 2 times: 3 May 2023 S2*, 15 Apr 2026 S2. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    3 May 2023 S2

    2
    A thin ring of radius 'RR' carries a uniformly distributed charge. The ring rotates at constant speed 'NN' r.p.s. about its axis perpendicular to the plane. If 'BB' is the magnetic field at the centre, the charge on the ring is (μ0=\mu_{0}= permeability of free space)

    Tap an option to check your answer.

  2. Question 2

    15 Apr 2026 S2

    134
    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/m2\mathrm{Wb/m^2} is ( μ0\mu_0 = permeability of free space )

    Tap an option to check your answer.