For a transparent medium relative permeablity and permittlivity, $\mu_{\mathrm{r}}$ and $\epsilon_{\mathrm{r}}$ are $1.0$ and $1.44$ respectively. The velocity of light in this medium would be,
$2.5 \times 10^{8} \;\mathrm{m} / \mathrm{s}$
$3 \times 10^{8} \;\mathrm{m} / \mathrm{s}$
$2.08 \times 10^{8} \;\mathrm{m} / \mathrm{s}$
$4.32 \times 10^{8} \;\mathrm{m} / \mathrm{s}$
A plane electromagnetic wave of frequency $25\; \mathrm{GHz}$ is propagating in vacuum along the $z-$direction. At a particular point in space and time, the magnetic field is given by $\overrightarrow{\mathrm{B}}=5 \times 10^{-8} \hat{\mathrm{j}}\; \mathrm{T}$. The corresponding electric field $\overrightarrow{\mathrm{E}}$ is (speed of light $\mathrm{c}=3 \times 10^{8}\; \mathrm{ms}^{-1})$
A red $LED$ emits light at $0.1$ watt uniformly around it. The amplitude of the electric field of the light at a distance of $1\ m$ from the diode is....$ Vm^{-1}$
Light wave is travelling along y-direction. If the corresponding $\vec E$ vector at any time is along the $x-$axis, the direction of $\vec B$ vector at that time is along
The nature of electromagnetic wave is :-
In an $EMW$ phase difference between electric and magnetic field vectors $\vec E$ and $\vec B$ is