Instantaneous displacement current of 2.0 A is set up in the space between two parallel plates of \(1~\mu F\) capacitor. The rate of change in potential difference across the capacitor is:
1.
2.
3.
4. None of these
A capacitor is having a capacity of 2 pF. The electric potential across the capacitor is changing with a value of \(10^{12}~\mathrm{V/s}\). The displacement current is:
1. | 2 A | 2. | 3 A |
3. | 6 A | 4. | 9 A |
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. |
If a source is transmitting an electromagnetic wave of frequency , then the wavelength of the electromagnetic wave transmitted from the source will be:
1. | 36.6 m | 2. | 40.5 m |
3. | 42.3 m | 4. | 50.9 m |
Light is a kind of wave. The wavelength of visible light ranges from about 4000 \(\overset{o}{A}\) to 7000 \(\overset{o}{A}\). Which of the following statements is false?
1. | \(\overset{o}{A}\) | Ultraviolet light has a wavelength shorter than 4000
2. | Infrared light has a wavelength longer than 7000 \(\overset{o}{A}\) |
3. | Red light has a wavelength near about 7000 \(\overset{o}{A}\) |
4. | Violet light has a wavelength near about 7000 \(\overset{o}{A}\) |
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.
In an electromagnetic wave, energy density associated with a magnetic field will be:
1.
2.
3.
4.
A variable frequency AC source is connected to a capacitor. Then on increasing the frequency:
1. | Both conduction current and displacement current will increase |
2. | Both conduction current and displacement current will decrease |
3. | Conduction current will increase and displacement current will decrease |
4. | Conduction current will decrease and displacement current will increase |
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 S.I. unit of displacement current is:
1. Henry
2. Coulomb
3. Ampere
4. Farad