Embibe Experts Solutions for Chapter: Electromagnetic Waves, Exercise 1: AP EAPCET 2021 (19-Aug Forenoon)

The amplitude of the electric field in a parallel beam of plane electromagnetic waves of intensity $53.1{\mathrm{Wm}}^{-2}$ is
(Permittivity of free space $=8.85\times {10}^{-12}{\mathrm{C}}^2 {\mathrm{N}}^{-1}{\mathrm{m}}^{-2}$)

The energies required to set up in a cube of side $10 \mathrm{cm}$, $\left(\mathrm{a}\right)$ A uniform electric field of ${10}^7 \mathrm{V} {\mathrm{m}}^{-1}$ and $\left(\mathrm{b}\right)$ A uniform magnetic field if $0.25 \mathrm{Wb} {\mathrm{m}}^{-2}$, are respectively about
$\left({\mu }_0=4\pi \times {10}^{-7} \mathrm{H} {\mathrm{m}}^{-1},{ϵ}_0=8.9\times {10}^{-12} \mathrm{F} {\mathrm{m}}^{-1}\right)$

An electromaghetic radiation has an energy $14.4\mathrm{keV}$. To which region of the electromagnetic spectrum it belongs

The magnetic field of a plane electromagnetic wave is given by $B=\left(400\mathrm{\mu T}\right)\sin \left[\left(4.0\mathrm{x}{10}^{15}{ \mathrm{s}}^{-1}\right)\left(\mathrm{t}-\frac{\mathrm{x}}{\mathrm{c}}\right)\right]$ Average energy density corresponding to the electric field is

The electric and the magnetic fields associated with an electromagnetic wave propagating along the Z- axis, can be represented by

The law which states that 'a variation in an electric field causes magnetic field', is