Question

Velocity of light is equal to

• A. $\sqrt{{\epsilon }_0{\mu }_0}$
• B. $\sqrt{{\epsilon }_0/{\mu }_0}$
• C. ${\epsilon }_0/{\mu }_0$
• D. $\sqrt{\frac{1}{{\epsilon }_0{\mu }_0}}$

Answer 1

Answer: (D)

Change in magnetic flux $(\varphi )=2\times 10^{-2}Wb$
and change in current $(I)=0.01A$.
Change in magnetic flux, $\varphi =2\times 10^{-2}=Ml$
$=M\times 0.01$ or $M=\frac{2\times 10^{-2}}{0.01}=2H$
(where $M=$ coefficient of mutual inductance).