Question

Velocity of light is equal to

• A. $\sqrt{\varepsilon_{0}\mu_{0}}$
• B. $\sqrt{\varepsilon_{0}/\mu_{0}}$
• C. ${\varepsilon_{0}/\mu_{0}}$
• D. $\sqrt{\frac{1}{\varepsilon_{0}\mu_{0}}}$

Answer 1

Answer: (D)

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