Q. The velocity of electromagnetic waves in a medium is$2 \times 10^{8}ms^{- 1}$. The dielectric constant of the medium is
A) 4
B) 2.25
C) 3/2
D) 2/3
Explanation
(b) $\sqrt{k} = \frac{v_{c}}{v} = \frac{3 \times 10^{8}}{2 \times 10^{9}} = \frac{3}{2};k = \frac{9}{4} = 2.25$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.