The velocity of electromagnetic radiation in a medium of permittivity and permeability is given by:
1.
2.
3.
4.
The electric and the magnetic field, associated with an electromagnetic wave, propagating along the +z-axis, can be represented by:
1. | \(\left[\mathrm{E}=\mathrm{E}_0 \widehat{\mathrm{k}}, \mathrm{B}=\mathrm{B}_0 \hat{\mathrm{i}}\right]\) |
2. | \(\left[\mathrm{E}=\mathrm{E}_0 \widehat{\mathrm{j}}, ~\mathrm{B}={\mathrm{B}_0} \hat{\mathrm{j}}\right]\) |
3. | \(\left[\mathrm{E}=\mathrm{E}_0 \widehat{\mathrm{j}}, ~\mathrm{B}={\mathrm{B}_0} \hat{\mathrm{k}}\right]\) |
4. | \(\left[\mathrm{E}=\mathrm{E}_0 \widehat{\mathrm{i}}, ~\mathrm{B}={\mathrm{B}_0} \hat{\mathrm{j}}\right]\) |
The electric field associated with an electromagnetic wave in vacuum is given by \(\mathrm{E}=40 \cos \left(k z-6 \times 10^8 t\right)\), where E, z, and t are in volt/m, meter, and second respectively. The value of the wave vector k would be:
1.
2.
3.
4. 3
An EM wave is propagating in a medium with a velocity \(\overrightarrow{{v}}={v} \hat{i}\). The instantaneous oscillating electric field of this EM wave is along the \(+y\) axis. The direction of the oscillating magnetic field of the EM wave will be along:
1. \(-z \text-\)direction
2. \(+z \text-\) direction
3. \(-y \text-\) direction
4. \(+y \text-\) direction
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 wave is parallel to:
1.
2.
3.
4.
An electromagnetic radiation has an energy \(14.4~\text{keV}\). To which region of the electromagnetic spectrum does it belong?
1. | Infrared region |
2. | Visible region |
3. | X-ray region |
4. | \(\gamma\)- ray region |
The charge of a parallel plate capacitor is varying as . Find the magnitude of displacement current through the capacitor.
(Plate Area = A, separation of plates = d)
1.
2.
3.
4.
The energy density of the electromagnetic wave in vacuum is given by the relation:
1.
2.
3.
4.
The S.I. unit of displacement current is:
1. Henry
2. Coulomb
3. Ampere
4. Farad