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NEET 2010
Exam
NEET
Year
2010
Subject
Physics
Chapter
Electromagnetic Induction

NEET 2010 · Physics · Electromagnetic Induction

A thin ring of radius R metre has charge q coulomb uniformly spread...

A thin ring of radius RR metre has charge qq coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of ff revolution/s. The value of magnetic induction in Wbm−2\mathrm{Wb} \mathrm{m}^{-2} at the centre of the ring is

Options

  1. Aμ0qf2πR\frac{\mu_0 q \mathrm{f}}{2 \pi \mathrm{R}}
  2. Bμ0q2πfR\frac{\mu_0 \mathrm{q}}{2 \pi \mathrm{f} R}
  3. Cμ0q2ff\frac{\mu_0 q}{2 f \mathrm{f}}
  4. Dμ0qf2R\frac{\mu_0 q f}{2 R}

Correct answer

D. μ0qf2R\frac{\mu_0 q f}{2 R}

Step-by-step solution

The magnetic field at the centre of the circle (B=\frac{\mu_0 I}{2 R}=\frac{\mu_0}{2 R}\left(\frac{q}{t}\right)=\frac{\mu_0 q f}{2 R})
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