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Q. No.Displacement current exists:
1.
when an electric field is changing in the circuit.
2.
when an electric field is constant.
3.
when an electric field is absent.
4.
always exists independent of the electric field.
Subtopic: Displacement Current |
81%
From NCERT
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Which of the following situation(s), can cause the radiation of an electromagnetic wave?
Choose the correct options:
| (A) | a varying sinusoidal current flowing through a capacitor |
| (B) | an electric dipole, whose size (and magnitude) is oscillating with time |
| (C) | a steady current flowing through a toroid |
Choose the correct options:
| 1. | only (A) |
| 2. | only (B) |
| 3. | only (A) & (B) |
| 4. | (A), (B), (C) |
Subtopic: Generation of EM Waves |
66%
From NCERT
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The region on the left of the \(y\)-axis \((x<0)\) represents vacuum, and the region on the right \((x>0)\) represents a transparent medium. An electromagnetic wave travelling along the \(x\)-axis given by:
\(\vec E_1(x,t)=E_1\hat j~\sin(\omega t-k_0x),\) where \(x<0,\)
is incident on to the medium on the right. The transmitted wave in the medium is:
\(\vec E_2(x,t)=E_2\hat j~\sin(\omega t-2k_0x),\) where \(x>0.\)
The refractive index of the medium is:
\(\vec E_1(x,t)=E_1\hat j~\sin(\omega t-k_0x),\) where \(x<0,\)
is incident on to the medium on the right. The transmitted wave in the medium is:
\(\vec E_2(x,t)=E_2\hat j~\sin(\omega t-2k_0x),\) where \(x>0.\)
The refractive index of the medium is:
| 1. | \(2\) | 2. | \(\sqrt2\) |
| 3. | \(4\) | 4. | \(2\sqrt2\) |
Subtopic: Properties of EM Waves |
67%
From NCERT
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Match List I with List II.
Choose the correct answer from the options given below:
| List - I (Electromagnetic waves) |
List - II (Wavelength) |
||
| (a) | AM radio waves | (i) | \(10^{-10}~\text{m}\) |
| (b) | Microwaves | (ii) | \(10^{2} ~\text{m}\) |
| (c) | Infrared radiation | (iii) | \(10^{-2} ~\text{m}\) |
| (d) | \(X\)-rays | (iv) | \(10^{-4} ~\text{m}\) |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iii) | (iv) | (i) |
| 2. | (iv) | (iii) | (ii) | (i) |
| 3. | (iii) | (ii) | (i) | (iv) |
| 4. | (iii) | (iv) | (ii) | (i) |
Subtopic: Electromagnetic Spectrum |
75%
From NCERT
NEET - 2022
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When light propagates through a material medium of relative permittivity, \(\varepsilon_{r}\) and relative permeability, \(\mu_{r}\) the velocity of light, \(v\) is given by:
(\(c\) = velocity of light in vacuum)
1. \(v=\dfrac{{c}}{\sqrt{\varepsilon_{r} \mu_{{r}}}}\)
2. \(v={c}\)
3. \(v=\sqrt{\dfrac{\mu_{{r}}}{\varepsilon_{{r}}}}\)
4. \(v=\sqrt{\dfrac{\varepsilon_{{r}}}{\mu_{{r}}}}\)
(\(c\) = velocity of light in vacuum)
1. \(v=\dfrac{{c}}{\sqrt{\varepsilon_{r} \mu_{{r}}}}\)
2. \(v={c}\)
3. \(v=\sqrt{\dfrac{\mu_{{r}}}{\varepsilon_{{r}}}}\)
4. \(v=\sqrt{\dfrac{\varepsilon_{{r}}}{\mu_{{r}}}}\)
Subtopic: Properties of EM Waves |
87%
From NCERT
NEET - 2022
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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%
From NCERT
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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%
From NCERT
NEET - 2022
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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