Displacement current is the same as:

1.	Conduction current due to the flow of free electrons
2.	Conduction current due to the flow of positive ions
3.	Conduction current due to the flow of both positive and negative free charge carriers
4.	It is not a conduction current but is caused by the time-varying electric field

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

The intensity of visible radiation at a distance of 1 m from a bulb of 100 W which converts only 5% of its power into light, is:

1. 0.4 W/m²

2. 0.5 W/m²

3. 0.1 W/m²

4. 0.01 W/m²

Which of the following statements about electromagnetic waves is/are correct:

1. A and B 
2. B and C
3. A, B and C
4. B only

Which of the following is not Maxwell's equation?
($\rho$= volume charge density, J = current density, m = pole strength, V = volume, S is closed surface, and C is closed loop)