A capacitor of capacitance \(C\) is connected across an AC source of voltage \(V\), given by;
\(V=V_0 \sin \omega t\)
The displacement current between the plates of the capacitor would then be given by:
1. \( I_d=\frac{V_0}{\omega C} \sin \omega t \)
2. \( I_d=V_0 \omega C \sin \omega t \)
3. \( I_d=V_0 \omega C \cos \omega t \)
4. \( I_d=\frac{V_0}{\omega C} \cos \omega t\)

Subtopic:  Displacement Current |
 55%
From NCERT
NEET - 2021
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For a plane electromagnetic wave propagating in the \(x\)-direction, which one of the following combinations gives the correct possible directions for the electric field \((E)\) and magnetic field \((B)\) respectively?
1. \(\hat{j}+\hat{k},~-\hat{j}-\hat{k}\)
2. \(-\hat{j}+\hat{k},~-\hat{j}+\hat{k}\)
3. \(\hat{j}+\hat{k},~\hat{j}+\hat{k}\)
4. \(-\hat{j}+\hat{k},~-\hat{j}-\hat{k}\)
Subtopic:  Properties of EM Waves |
From NCERT
NEET - 2021
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The biological importance of the ozone layer is:

1. it stops ultraviolet rays.
2. ozone layer reduces the greenhouse effect.
3. ozone layer reflects radio waves.
4. ozone layer controls \(\mathrm{O}_2 / \mathrm{H}_2\) ratio in the atmosphere.


 

Subtopic:  Electromagnetic Spectrum |
 85%
From NCERT
AIPMT - 2001
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The velocity of electromagnetic waves is parallel to:

1. B×E

2. E×B

3. E

4. B

Subtopic:  Properties of EM Waves |
 90%
From NCERT
AIPMT - 2002
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If the frequency of an E.M. wave is 10 MHz, then its wavelength is:
1.  30 m
2.  300 m
3.  3 m
4.  none of the above

Subtopic:  Properties of EM Waves |
 75%
From NCERT
AIPMT - 1999
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What is the cause of “Greenhouse effect”?

1. Infra-red rays

2. Ultraviolet rays

3. X-rays

4. Radio waves

Subtopic:  Electromagnetic Spectrum |
 62%
From NCERT
AIPMT - 2002
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Which of the following has the minimum wavelength?
1. X-rays
2. Ultraviolet rays
3. γ-rays
4. Cosmic rays

Subtopic:  Electromagnetic Spectrum |
From NCERT
AIPMT - 2002
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If \(\lambda_{\mathrm{v}}, \lambda_{\mathrm{x}},\) and\(\lambda_\mathrm{m}\) represent the wavelengths of visible light, x-rays and microwaves respectively, then:
1. \( \lambda_{\mathrm{m}}>\lambda_{\mathrm{x}}>\lambda_{\mathrm{v}} \)
2. \( \lambda_\mathrm{v}>\lambda_\mathrm{m}>\lambda_\mathrm{x } \)
3. \( \lambda_\mathrm{v}>\lambda_\mathrm{x}>\lambda_\mathrm{m }\)
4. \(\lambda_{\mathrm{m}}>\lambda_{\mathrm{v}}>\lambda_{\mathrm{x}}\)

Subtopic:  Electromagnetic Spectrum |
 87%
From NCERT
AIPMT - 2005
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The frequency order for \(\gamma\) - rays (\(b\)), X – rays (\(a\)), and UV – rays (\(c\)) is:

1. \( b>a>c \) 2. \( a>b>c \)
3. \( c>b>a \) 4. \( a>c>b\)
Subtopic:  Electromagnetic Spectrum |
 81%
From NCERT
AIPMT - 2000
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The electric field of an electromagnetic wave in free space is given by –
E=10 cos (107t+kx) j^ V/m, where t and x are in seconds and metres respectively. It can be inferred that:

(a) The wavelength λ is 188.4 m
(b) The wave number k is 0.33 rad / m
(c) The wave amplitude is 10 V / m
(d) The wave is propagating along + x direction

Which one of the following pairs of statements is correct?

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. (a) and (c)

Subtopic:  Properties of EM Waves |
From NCERT
AIPMT - 2010
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