Question

The electromagnetic waves travel in a medium at a speed of 2.0 × 108 m/s. The relative permeability of the medium is 1.0. The relative permittivity of the medium will be

• A. 2.25
• B. 4.25
• C. 6.25
• D. 8.25

Answer 1

Answer: (A)

2.25

Answer 2

The correct option is(A): 2.25.

$n=\frac{c}{v}=\frac{3}{2}$

$\sqrt{∈μ}=n$

So

$∈=\frac{9}{4}=2.25$