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MHT CET202123 Sep 2021Evening ShiftPhysicsMagnetic Effects of CurrentActual

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 revolution/s. The value of magnetic induction in Wb m ⁻² at the center of the ring is ( ₀= Permeability of free space)

Options

  1. A₀ q f 2 R
  2. B₀ q 2 R
  3. C₀ qf 2 R
  4. D₀ q 2 fR

Correct answer

C. ₀ qf 2 R

Step-by-step solution

For circular coil of radius R carrying a current I , the magnetic field at the center is given by B= ₀ I 2 R Here I = qf B = ₀ qf 2 R

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