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NEET 2008
Exam
NEET
Year
2008
Subject
Physics
Chapter
Electromagnetic Induction

NEET 2008 · Physics · Electromagnetic Induction

A circular disc of radius 0.2 meter is placed in a uniform magnetic...

A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction linked with the disc is

Options

  1. A0.01ωb0.01 \omega b
  2. B0.02ωb0.02 \omega b
  3. C0.06ωb0.06 \omega b
  4. D0.08ωb0.08 \omega b

Correct answer

B. 0.02ωb0.02 \omega b

Step-by-step solution

 Magnetic flux =BAcos⁡θ=1π×π(0.2)2×cos⁡60∘=0.04×12=0.02wb\begin{aligned}& \text{ Magnetic flux }=B A \cos \theta=\frac{1}{\pi} \times \pi(0.2)^2 \times \cos60^{{}^{\circ}} \\ & =0.04 \times \frac{1}{2}=0.02 \mathrm{wb} \end{aligned}
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