1. | \(2.5\times 10^{8}~\text{m/s}\) | 2. | \(3\times 10^{8}~\text{m/s}\) |
3. | \(2.08\times 10^{8}~\text{m/s}\) | 4. | \(4.32\times 10^{8}~\text{m/s}\) |
A parallel plate capacitor of capacitance \(20~\mu\text{F}\) is being charged by a voltage source whose potential is changing at the rate of \(3~\text{V/s}\). The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively:
1. zero, zero
2. zero, \(60~\mu\text{A}\)
3. \(60~\mu\text{A}\), \(60~\mu\text{A}\)
4. \(60~\mu\text{A}\), zero
Which colour of the light has the longest wavelength?
1. violet
2. red
3. blue
4. green
The electric and magnetic fields of an electromagnetic wave are:
1. | In phase and parallel to each other |
2. | In opposite phases and perpendicular to each other |
3. | In opposite phases and parallel to each other |
4. | In phase and perpendicular to each other |
The velocity of electromagnetic radiation in a medium of permittivity and permeability is given by:
1.
2.
3.
4.
1. | Moving along y-direction with frequency 21 π x 106 Hz and wavelength 200 m. |
2. | Moving along x-direction with frequency 106 Hz and wavelength 100m |
3. | Moving along x-direction with frequency 106 Hz and wavelength 200m |
4. | Moving along x-direction with frequency 106 Hz and wavelength 800m |
Which of the following statement is false for the properties of electromagnetic waves?
1. | Both electric and magnetic field vectors attain the maxima and minima at the same place and same time. |
2. | The energy in the electromagnetic wave is divided equally between electric and magnetic vectors. |
3. | Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of the wave. |
4. | These waves do not require any material medium for propagation. |
1. | gamma rays, ultraviolet, infrared, microwaves. |
2. | microwaves, gamma rays, infrared, ultraviolet. |
3. | infrared, microwave, ultraviolet, gamma rays. |
4. | microwave, infrared, ultraviolet, gamma rays. |
The electric and the magnetic fields, associated with an electromagnetic wave, propagating along the positive Z-axis, can be represented by:
1. \(\left [E=E_{0}\hat{k},~B=B_{0}\hat{i} \right ]\)
2. \(\left [E=E_{0}\hat{j},~B=B_{0}\hat{j} \right ]\)
3. \(\left [E=E_{0}\hat{j},~B=B_{0}\hat{k} \right ]\)
4. \(\left [E=E_{0}\hat{i},~B=B_{0}\hat{j} \right ]\)