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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
Subtopic: Displacement Current |
74%
Level 2: 60%+
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Instantaneous displacement current of \(2.0~\text A\) is set up in the space between two parallel plates of \(1~\mu \text{F}\) capacitor. The rate of change in potential difference across the capacitor is:
1. \(3\times 10^{6}~\text{V/s}\)
2. \(4\times 10^{6}~\text{V/s}\)
3. \(2\times 10^{6}~\text{V/s}\)
4. None of these
Subtopic: Displacement Current |
89%
Level 1: 80%+
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A capacitor is having a capacity of \(2~\text{pF}\). The electric potential across the capacitor is changing with a value of \(10^{12}~\text{V/s}\). The displacement current is:
1. \(2~\text A\)
2. \(3~\text A\)
3. \(6~\text A\)
4. \(9~\text A\)
1. \(2~\text A\)
2. \(3~\text A\)
3. \(6~\text A\)
4. \(9~\text A\)
Subtopic: Displacement Current |
90%
Level 1: 80%+
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Given below are two statements:
| Assertion (A): | Light can travel in vacuum but sound cannot do so. |
| Reason (R): | Light is an electromagnetic wave and sound is a mechanical wave. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Properties of EM Waves |
84%
Level 1: 80%+
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If a source is transmitting an electromagnetic wave of frequency \(8.2\times 10^{6}~\text{Hz}\), 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 |
Subtopic: Generation of EM Waves |
88%
Level 1: 80%+
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Light is a kind of wave. The wavelength of visible light ranges from about \(4000~\mathring{A}\) to \(7000~\mathring{A}\). Which of the following statements is false?
| 1. | Ultraviolet light has a wavelength shorter than \(4000~\mathring{A}\). |
| 2. | Infrared light has a wavelength longer than \(7000~\mathring{A}\). |
| 3. | Red light has a wavelength near about \(7000~\mathring{A}\). |
| 4. | Violet light has a wavelength near about \(7000~\mathring{A}\). |
Subtopic: Electromagnetic Spectrum |
76%
Level 2: 60%+
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A plane electromagnetic wave travels in free space along \(x\text-\)axis. At a particular point in space, the electric field along \(y\text-\)axis is \(9.3~\text{Vm}^{-1}.\) The magnetic induction is:
| 1. | \(3.1\times 10^{-8}~\text{T}\) | 2. | \(3\times 10^{-5}~\text{T}\) |
| 3. | \(3\times 10^{-6}~\text{T}\) | 4. | \(9.3\times 10^{-6}~\text{T}\) |
Subtopic: Properties of EM Waves |
91%
Level 1: 80%+
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In an electromagnetic wave, energy density associated with a magnetic field will be:
| 1. | 2. | ||
| 3. | 4. |
|
Subtopic: Properties of EM Waves |
86%
Level 1: 80%+
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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 |
Subtopic: Properties of EM Waves |
90%
Level 1: 80%+
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Subtopic: Displacement Current |
89%
Level 1: 80%+
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