In a plane E.M. wave, the electric field oscillates sinusoidally at a frequency of 2.5 $\times {10}^{10}$ Hz and amplitude 480 V/m.  The amplitude of the oscillating magnetic field will be:

(1) $1.52\times {10}^{-8} Wb/m^2$

(2) $1.52\times {10}^{-7} Wb/m^2$

(3) $1.6\times {10}^{-6} Wb/m^2$

(4) $1.6\times {10}^{-7} Wb/m^2$

The charge of a parallel plate capacitor is varying as $q=q_0 \sin \omega t$.  Then find the magnitude of displacement current through the capacitor.  (Plate Area = A, separation of plates = d)

(1) $q_0 \cos \left(\omega t\right)$                      (2) $q_0\omega \sin \omega t$

(3) $q_0\omega \cos \omega t$                     (4) $\frac{q_{0}A\omega }{d}\cos \omega t$

The most penetrating radiation out of the following is:
1. \(X\text-\)rays
2. \(\beta\text-\)rays
3. \(\alpha\text-\)rays
4. \(\gamma\text-\)rays

The direction of propagation of the electromagnetic wave is the same as that of (Here $\overrightarrow{E}$=electric field vector and $\overrightarrow{B}$=magnetic field vector):

(1) $\overrightarrow{E}\times \overrightarrow{B}$

(2) $\overrightarrow{B}\times \overrightarrow{E}$

(3) $\overrightarrow{E}$

(4) $\overrightarrow{B}$

The rate of change of the voltage of a parallel plate capacitor if the instantaneous displacement current of 1 A is established between the two plates of a 1 $\mu$F parallel plate capacitor:

(1) ${10}^6 V/s$                (2) 10 V/s

(3) ${10}^8 V/s$                (4) ${10}^{-6} V/s$

The energy density of the electromagnetic wave in vacuum is given by the relation

(1) $\frac{1}{2}.\frac{E^2}{{\epsilon }_0}+\frac{B^2}{2{\mu }_0}$                 (2) $\frac{1}{2}{\epsilon }_0{E}^2+\frac{1}{2}{\mu }_0{B}^2$

(3) $\frac{E^2+B^2}{C}$                           (4) $\frac{1}{2}{\epsilon }_0{E}^2+\frac{B^2}{2{\mu }_0}$

The relation between electric field E and magnetic field induction B in an electromagnetic waves

(1) $E=\sqrt{\frac{{\mu }_0}{{\epsilon }_0}} B$                     (2) E = cB

(3) E = $\frac{B}{c}$                                (4) $E=\frac{B}{c^2}$

Out of the following options which one can be used to produce a propagating electromagnetic wave?

1. A stationary charge               2. A chargeless particle

3. An accelerating charge          4. A charge moving at constant velocity

The velocity of electromagnetic radiation in a medium of permittivity ${\epsilon }_0$ and permeability ${\mu }_0$ is given by 

1. $\sqrt{\frac{{\epsilon }_o}{{\mu }_o}}$

2. $\sqrt{{\mu }_o{\epsilon }_o}$

3. $\frac{1}{\sqrt{{\mu }_o{\epsilon }_o}}$

4. $\sqrt{\frac{{\mu }_o}{{\epsilon }_o}}$