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Q. No.Given below are two statements:
Assertion (A):
A charge moving in a circular orbit can produce an electromagnetic wave.
Reason (R):
The source of the electromagnetic wave should be in accelerated motion.
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.
Both (A) and (R) are False.
Subtopic: Generation of EM Waves |
82%
Level 1: 80%+
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If \(\lambda_X,\lambda_I,\lambda_M\) and \(\lambda_\gamma\) are the wavelengths of \(X\)-rays, infrared rays, microwaves and \(\gamma\)-rays respectively, then:
| 1. | \(\lambda_\gamma<\lambda_X<\lambda_I<\lambda_M\) |
| 2. | \(\lambda_M<\lambda_I<\lambda_X<\lambda_\gamma\) |
| 3. | \(\lambda_X<\lambda_\gamma<\lambda_M<\lambda_I\) |
| 4. | \(\lambda_X<\lambda_I<\lambda_\gamma<\lambda_M\) |
Subtopic: Electromagnetic Spectrum |
84%
Level 1: 80%+
NEET - 2022
Hints
Given below are two statements.
| Assertion (A): | Light can travel in vacuum whereas sound cannot. |
| Reason (R): | Light is an electromagnetic wave whereas 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. | Both (A) and (R) are False. |
Subtopic: Properties of EM Waves |
88%
Level 1: 80%+
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A light wave traveling in air along \(x\)-direction is given by \(E_{y}=540 \sin \pi \times 10^{4}(x-c t) \) Vm–1. The peak value of the magnetic field of the wave will be: (Given \( c= 3 \times 10^8 \) ms–1)
1. \(18 \times 10^{-7}\) T
2. \(54 \times 10^{-7}\) T
3. \(54 \times 10^{-8}\) T
4. \(18 \times 10^{-8}\) T
1. \(18 \times 10^{-7}\) T
2. \(54 \times 10^{-7}\) T
3. \(54 \times 10^{-8}\) T
4. \(18 \times 10^{-8}\) T
Subtopic: Properties of EM Waves |
87%
Level 1: 80%+
JEE
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The magnetic field of a plane electromagnetic wave is given by;
\(\vec{B}=2 \times 10^{-8} \sin \left(0.5 \times 10^{3} {x}+1.5 \times 10^{11 } {t}\right) \hat{{j}}~\text{T}\)
The amplitude of the electric field would be:
1. \(6~\text{Vm}^{-1}\) along \(x\)-axis
2. \(3~ \text{Vm}^{-1}\) along \(z\)-axis
3. \(6~ \text{Vm}^{-1}\) along \(z\)-axis
4. \(2 \times 10^8 ~\text{Vm}^{-1}\) along \(z\)-axis
\(\vec{B}=2 \times 10^{-8} \sin \left(0.5 \times 10^{3} {x}+1.5 \times 10^{11 } {t}\right) \hat{{j}}~\text{T}\)
The amplitude of the electric field would be:
1. \(6~\text{Vm}^{-1}\) along \(x\)-axis
2. \(3~ \text{Vm}^{-1}\) along \(z\)-axis
3. \(6~ \text{Vm}^{-1}\) along \(z\)-axis
4. \(2 \times 10^8 ~\text{Vm}^{-1}\) along \(z\)-axis
Subtopic: Properties of EM Waves |
73%
Level 2: 60%+
JEE
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The speed of electromagnetic waves is:
| 1. | higher in vacuum compared to other media. |
| 2. | lower in vacuum compared to other media. |
| 3. | independent of the medium. |
| 4. | lower in some media than in vacuum, and higher in others. |
Subtopic: Properties of EM Waves |
68%
Level 2: 60%+
Hints
A displacement current of \(4.425~\mu\text A\) is developed in the space between the plates of a parallel plate capacitor when voltage is changing at a rate of \(10^{6}~\text{V/s}.\) The area of each plate of the capacitor is \(40~\text{cm}^2.\) The distance between each plate of the capacitor is \(x \times 10^{-3}~\text m.\) The value of \(x\) is:
(the permittivity of free space, \(\epsilon_0=8.85\times10^{-12}~\text{C}^2 \text{N}^{-1} \text{m}^{-2}\) )
1. \(2\)
2. \(4\)
3. \(6\)
4. \(8\)
(the permittivity of free space, \(\epsilon_0=8.85\times10^{-12}~\text{C}^2 \text{N}^{-1} \text{m}^{-2}\) )
1. \(2\)
2. \(4\)
3. \(6\)
4. \(8\)
Subtopic: Displacement Current |
77%
Level 2: 60%+
JEE
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Match List–I with List–II.
Choose the correct answer from the options given below:
| List-I | List-II | ||
| (A) | UV rays | (I) | Diagnostic tool is medicine |
| (B) | X-rays | (II) | Water purification |
| (C) | Microwave | (III) | Communication, Radar |
| (D) | Infrared wave | (IV) | Improving visibility on foggy days |
Choose the correct answer from the options given below:
| 1. | A-III, B-II, C-I, D-IV |
| 2. | A-II, B-I, C-III, D-IV |
| 3. | A-II, B-IV, C-IIII, D-I |
| 4. | A-III, B-I, C-II, D-IV |
Subtopic: Electromagnetic Spectrum |
85%
Level 1: 80%+
JEE
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During the propagation of the electromagnetic wave in a medium:
| 1. | electric energy density is double the magnetic energy density. |
| 2. | electric energy density is half the magnetic energy density. |
| 3. | electric energy density is equal to magnetic energy density. |
| 4. | the electric energy density & magnetic energy density are not related to each other. |
Subtopic: Properties of EM Waves |
87%
Level 1: 80%+
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The velocity of electromagnetic waves in a material medium is \(\dfrac{c}{\sqrt{2}}~\left(c=3 \times 10^8 ~\text{m/s} \right)\). Its permeability is nearly equal to the free space permeability, \(\mu_0\). Its permittivity \(\varepsilon\) is:
(\(\varepsilon_0\) is free space permittivity)
(\(\varepsilon_0\) is free space permittivity)
| 1. | \(\sqrt 2 \varepsilon_0\) | 2. | \(2\varepsilon_0\) |
| 3. | \(1.5\varepsilon_0\) | 4. | \(3\varepsilon_0\) |
Subtopic: Properties of EM Waves |
70%
Level 2: 60%+
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