Question 198: EM waves

Question

When light propagates through a material medium of relative permittivity $$\varepsilon $$
r
and relative permeability $$\mu$$
r
, the velocity of light, v is given by (c-velocity of light in vacuum)

Accepted Answer

$$v = {1 \over {\sqrt {{\varepsilon _m}{\mu _m}} }}$$
$$v = {1 \over {\sqrt {{\varepsilon _0}{\varepsilon _r}{\mu _0}{\mu _r}} }}$$
Since $$c = {1 \over {\sqrt {{\varepsilon _0}{\mu _0}} }}$$
$$ \Rightarrow v = {c \over {\sqrt {{\varepsilon _r}{\mu _r}} }}$$

Answer

v = c

Answer

$$v = \sqrt {{{{\mu _r}} \over {{\varepsilon _r}}}} $$

Answer

$$v = \sqrt {{{{\varepsilon _r}} \over {{\mu _r}}}} $$

Answer

$$v = {c \over {\sqrt {{\varepsilon _r}{\mu _r}} }}$$

EM waves

When light propagates through a material medium of relative permittivity $\varepsilon r and relative permeability \mu$ r , the velocity of light, v is given by (c-velocity of light in vacuum)

Choose the correct answer: