In an electric circuit, there is a capacitor of reactance 100 $\mathrm{\Omega }$ connected across the source of 220 V. The rms value of displacement current will be:
1. 2.2 A 

2. 0.22 A 

3. 4.2 A 

4. 2.4 A

An electromagnetic radiation has an energy \(14.4~\text{keV}\). To which region of the electromagnetic spectrum does it belong?

The velocity of electromagnetic wave is parallel to:

1. $\overrightarrow{\mathrm{B}}\times \overrightarrow{\mathrm{E}}$

2. $\overrightarrow{E}\times \overrightarrow{B}$

3. $\overrightarrow{\mathrm{E}}$

4. $\overrightarrow{\mathrm{B}}$

Displacement current is the same as:

The charge of a parallel plate capacitor is varying as $q=q_0\sin \omega t$. 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. $\frac{q_{0}A\omega }{d}\cos \omega t$

In electromagnetic wave the phase difference between electric and magnetic field vectors $\overrightarrow{E}$ $and$ $\overrightarrow{B}$ is:

1. 0

2. $\mathrm{\pi }/2$

3. $\mathrm{\pi }$

4. $\mathrm{\pi }/4$

An electromagnetic wave going through the vacuum is described by $E=E_0\sin (kx-\omega t).$

Which is the following is/are independent of the wavelength?

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

A lamp radiates power $P_0$ uniformly in all directions. The amplitude of electric field strength $E_0$ at a distance r from it is:

1. $E_0=\frac{P_0}{2{\mathrm{\pi \epsilon }}_0{\mathrm{cr}}^2}$

2. $E_0=\sqrt{\left\{\frac{P_0}{2{\mathrm{\pi \epsilon }}_{0}c{r}^2}\right\}}$

3. $E_0=\sqrt{\left\{\frac{P_0}{4{\mathrm{\pi \epsilon }}_0{\mathrm{cr}}^2}\right\}}$ 

4. $E_0=\sqrt{\left\{\frac{P_0}{8{\mathrm{\pi \epsilon }}_0{\mathrm{cr}}^{}}\right\}}$