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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Displacement current is:

1. continuous, when the electric field is changing in the circuit.
2. continuous, when the magnetic field is changing in the circuit.
3. continuous in both types of fields.
4. continuous through wires and resistance only.
Subtopic:  Maxwell's Equations |
 59%
From NCERT
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A radiowave has a maximum magnetic field induction of 10-4 T on arrival at a receiving antenna. The maximum electric field intensity of such a wave is

(1) zero

(2) 3×104 V/m

(3) 5.8×10-9 V/m

(4) 3.3×1013  V/m

Subtopic:  Properties of EM Waves |
 82%
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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The shortest wavelength is for 

(1) γ-rays

(2) X-rays

(3) ultraviolet rays

(4) microwaves

Subtopic:  Electromagnetic Spectrum |
 83%
From NCERT
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An accelerated charge :

(1) emits an electromagnetic wave

(2) does not emit electromagnetic wave

(3) produces a gravitational field

(4) None of these

Subtopic:  Generation of EM Waves |
 94%
From NCERT
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The electromagnetic radiations are in descending order of wavelength in the following sequences :

(1) infra-red waves, radio waves, X-rays, visible light rays

(2) Radio-waves, infra-red waves, visible light rays, X-rays

(3) Radio waves, visible light rays, infra-red waves, X-rays

(4) X-rays, visible light rays, infra-red wave, radio-waves

Subtopic:  Electromagnetic Spectrum |
 81%
From NCERT
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X-rays and γ-rays are both electromagnetic waves, which one of the following statements is true?

(1) in general, X-rays have a larger wavelength than that of γ-rays

(2) X-rays have a smaller wavelength than that of γ-rays

(3) γ-rays have smaller frequency than that of X-rays

(4) wavelength and frequency of X-rays are both larger than those of γ-rays.

Subtopic:  Properties of EM Waves |
 85%
From NCERT
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Which of the following are not electromagnetic waves?

(1) cosmic rays

(2) gamma rays

(3) microwaves

(4) X-rays

Subtopic:  Electromagnetic Spectrum |
 52%
From NCERT
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