Q. The refractive index and the permeability of a medium are respectively 1.5 and $5 \times 10^{- 7}Hm^{- 1}$. The relative permittivity of the medium is nearly

A) 25
B) 15
C) 81
D) 6
Explanation

(d) $\frac{c^{2}}{v^{2}} = \frac{\mu}{\mu_{0}} \bullet \frac{\varepsilon}{\varepsilon_{0}}$
$\therefore\frac{\varepsilon}{\varepsilon_{0}} = \frac{9 \times 10^{16}}{4 \times 10^{16}} \times \frac{4\pi \times 10^{- 7}}{5 \times 10^{- 7}} = 5.8 \approx 6$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.