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

A circular disc of radius $0.2$ meter is placed in a uniform magnetic field of induction linked with the disc is ? (The magnetic field induction $B$ is given as $B=\frac{1}{\pi}\ \text{Wb/m}^{2}$ and angle between the is 60 degree).
  1. $0.01 \omega b$
  2. $0.02 \omega b$
  3. $0.06 \omega b$
  4. $0.08 \omega b$

Solution

$\begin{aligned} & \text { Magnetic flux }=B A \cos \theta=\frac{1}{\pi} \times \pi(0.2)^2 \times \cos 60^{\circ} \\ & =0.04 \times \frac{1}{2}=0.02 \mathrm{wb} \end{aligned}$

Asked in: NEET 2008 (Mains)

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