Question

A circular disc of radius 0.2 metre is placed in a uniform magnetic field of induction $\frac{1}{\pi }\left(\frac{wb}{m^2}\right)$ in such a way that its axis makes an angle of 60 with $\overrightarrow{B}$ The magnetic flux linked with the disc is:

• A. 0.058 wb
• B. 0.01 wb
• C. 0.02 wb
• D. 0.06 wb

Answer 1

The correct option is C 0.02 wb

$A=\pi r^2=0.04\pi$

$\Phi =BAcos\theta$

$=\frac{1}{\pi }\times 0.04\pi \times cos60=0.02Wb$