An electromagnetic wave travels at a speed of 0.8 c in medium .Determine the value of relative permittivity of the medium if value is

Explanation

To determine the relative permittivity of a medium in which an electromagnetic wave travels at a speed of 0.8c, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the relationship between speed of light, permittivity, and permeability:**
The speed of light in vacuum (c) is given by the formula:
\[
c = \frac{1}{\sqrt{\mu_0 \epsilon_0}}
...