The relation between electric field E and magnetic field intensity H in an electromagnetic wave is:
(1) E = H
(2)
(3)
(4)
An electromagnetic wave going through Vaccum is described by
(1)
(2)
(3)
(4) none of these
The ratio of for a plane electromagnetic wave has the dimension of
(1) Impedance
(2) Resistance
(3) Both
(4) None
If an electromagnetic wave going through a medium is given by;
\(E=E_{0}sin\left ( kx-\omega t \right )\) and \(B=B_{0}sin\left ( kx-\omega t \right ),\) then:
1. | |
2. | If the electric field is in the z-direction then the magnetic field should be in the -y direction |
3. | Both 1 and 2 are correct |
4. | Only 1 is correct |
A plane E M wave of frequency 25 MHz travels in free space in the x-direction. At a particular point in space and time then B at the point is
(1)
(2)
(3) 2.1
(4)
In an electromagnetic wave, the amplitude of electric field is 1 V/m. The frequency of wave is . The wave is propagating along Z-axis. The average energy density of electric field in joule/, will be
(1)
(2) 4.4
(3) 6.6
(4) 8.8
The infra-red spectrum lies between :
(1) radio wave and microwave region
(2) the micro-wave and visible region
(3) the visible and ultraviolet region
(4) the ultraviolet and the X-ray region
Consider an electric charge oscillating with a frequency of 10 MHz. The radiation emitted will have a wavelength equal to:
1. | 20 m | 2. | 30 m |
3. | 40 m | 4. | 10 m |
Which of the following electromagnetic waves has minimum frequency?
1. Radio waves
2. Infrared waves
3. Microwaves
4. X-rays
A parallel plate capacitor consists of two circular plates each of radius 12 cm and separated by 5.0 mm. The capacitor is being charged by an external source. The charging current is constant and is equal to 0.15 A. The rate of change of the potential difference between the plates will be:
1. | \(1.873 \times 10^7 \mathrm{~V} / \mathrm{s}\) |
2. | \(1.873 \times 10^8 \mathrm{~V} / \mathrm{s}\) |
3. | \(1.873 \times 10^9 \mathrm{~V} / \mathrm{s}\) |
4. | \(1.873 \times 10^{10} \mathrm{~V} / \mathrm{s}\) |