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%
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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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In an electromagnetic wave, energy density associated with a magnetic field will be:

1. 12LI2

2. B22μ0

3. 12μ0B2

4. 12qB2

Subtopic:  Properties of EM Waves |
 84%
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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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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