The velocity of electromagnetic radiation in a medium of permittivity and permeability is given by:
1.
2.
3.
4.
The magnetic field amplitude of an electromagnetic wave is T. Its electric field amplitude if the wave is travelling in free space is:
1. \(6~\mathrm{Vm^{-1}}\)
2. \(60~\mathrm{Vm^{-1}}\)
3. \(\frac{10}{6}~\mathrm{Vm^{-1}}\)
4. None of these
A plane electromagnetic wave travels in free space along x-axis. At a particular point in space, the electric field along y-axis is 9.3 . The magnetic induction is:
1.
2.
3.
4.
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 |
The velocity of electromagnetic wave is parallel to:
1.
2.
3.
4.
I: | Light can travel in vacuum but sound cannot do so. |
II: | Light is an electromagnetic wave and sound is a mechanical wave. |
1. | Both I and II are true and II is the correct explanation of I. |
2. | Both I and II are true but II is not the correct explanation of I. |
3. | I is true but II is false. |
4. | I is false but II is true. |
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. | \(\left[\mathrm{E}=\mathrm{E}_0 \widehat{\mathrm{i}}, ~\mathrm{B}={\mathrm{B}_0} \hat{\mathrm{j}}\right]\) |
Which of the following statements is false regarding the properties of electromagnetic waves?
1. | Both electric and magnetic field vectors attain the maxima and minima at the same place and the same time |
2. | The energy in an 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 |
In an electromagnetic wave, energy density associated with a magnetic field will be:
1.
2.
3.
4.
Consider an oscillator which has a charged particle oscillating about its mean position with a frequency of 300 MHz. The wavelength of electromagnetic waves produced by this oscillator would be:
1. 1 m
2. 10 m
3. 100 m
4. 1000 m