Q. The velocity of electromagnetic wave in good conductor is
A) $3 \times 10^{8}\ ms^{- 1}$
B) More than $3 \times 10^{8}ms^{- 1}$
C) Very low
D) High
Explanation
(c) The velocity of electromagnetic waves in a conductor is given by
$v = \frac{1}{\sqrt{\mu_{0}\mu_{r}\varepsilon_{0}\varepsilon_{r}}} = \frac{c}{\sqrt{\mu_{r}\varepsilon_{r}}}$
Since, the value of $\mu_{r}$ and $\varepsilon_{r}$ are greater than 1, hence $v < < c$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.