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 |
 73%
From NCERT
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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. 3×106 V/s

2. 4×106 V/s

3. 2×106 V/s

4. None of these

Subtopic:  Displacement Current |
 87%
From NCERT
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Which statement is incorrect?

1.  Speed of light in free space \(=\frac{1}{\sqrt{\mu_0 \epsilon_0}}\) 
2.  Speed of light in the medium \(=\frac{1}{\sqrt{\mu \epsilon}}\)
3. \(\frac{E_0}{B_0}=c\)
4. \(\frac{B_0}{E_0}=c\)

Subtopic:  Properties of EM Waves |
 89%
From NCERT
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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
Subtopic:  Displacement Current |
 90%
From NCERT
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Select the correct option based on statements:
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.
Subtopic:  Properties of EM Waves |
 82%
From NCERT
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If a source is transmitting an electromagnetic wave of frequency 8.2×106 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%
From NCERT
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If ε0 and μ0 represent the permittivity and permeability of vacuum and ε and  μ represent the permittivity and permeability of the medium, the refractive index of the medium is given by:

1. ε0μ0εμ

2. εμε0μ0

3. εμ0ε0

4. μ0ε0ε

Subtopic:  Properties of EM Waves |
 72%
From NCERT
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The magnetic field in a plane electromagnetic wave is given by

Bz=2×10-7 sin (0.5×103x-1.5×1011t) Tesla

The expression for the electric field will be:

1. \(E_z=30 \sqrt{2} \sin \left(0.5 \times 10^3 x-1.5 \times 10^{11} t\right) V / m\)
2. \(E_z=60 \sin \left(0.5 \times 10^3 x-1.5 \times 10^{11} t\right) V / m\)
3. \(E_y=30 \sqrt{2} \sin \left(0.5 \times 10^{11} x-1.5 \times 10^3 t\right) V / m\)
4. \(E_y=60 \sin \left(0.5 \times 10^3 x-1.5 \times 10^{11} t\right) V / m\)

Subtopic:  Properties of EM Waves |
 78%
From NCERT
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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. Ultraviolet light has a wavelength shorter than 4000 \(\overset{o}{A}\)
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 \(\overset{o}{A}\)

Subtopic:  Electromagnetic Spectrum |
 75%
From NCERT
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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 Vm-1. The magnetic induction is:

1. 3.1×10-8 T

2. 3×10-5 T

3. 3×10-6 T

4. 9.3×10-6 T

Subtopic:  Properties of EM Waves |
 90%
From NCERT
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