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Q. No.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
Subtopic: Properties of EM Waves |
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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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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 |
67%
From NCERT
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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%
From NCERT
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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%
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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%
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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%
From NCERT
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Which of the following statement is not correct?
| 1. | Electromagnetic waves can be diffracted, refracted and polarised. |
| 2. | Electromagnetic waves carry both energy and momentum. |
| 3. | Electromagnetic waves exert radiation pressure. |
| 4. | Material medium is required for the propagation of electromagnetic waves. |
Subtopic: Properties of EM Waves |
84%
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If the total energy of electromagnetic waves falling on a surface is \(E,\) for total absorption, the momentum delivered will be: (where \(c\) is the speed of light)
1. \(E/c\)
2. \(2E/c\)
3. \(4E/c\)
4. \(E/2c\)
1. \(E/c\)
2. \(2E/c\)
3. \(4E/c\)
4. \(E/2c\)
Subtopic: Properties of EM Waves |
75%
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Light wave is travelling along the \(y\text-\)axis. The electric field vector \(\vec{E}\) is along the \(x\text-\)axis. The corresponding direction of magnetic field vector \(\vec{B}\) will be along the:
1. \(y\text-\)axis
2. \(-x\text-\)axis
3. \(+z\text-\)axis
4. \(-z\text-\)axis
1. \(y\text-\)axis
2. \(-x\text-\)axis
3. \(+z\text-\)axis
4. \(-z\text-\)axis
Subtopic: Properties of EM Waves |
64%
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