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Q. No.A compass needle is placed in the gap of a parallel plate capacitor. The capacitor is connected to a battery through a resistance. The compass needle:
1.
does not deflect.
2.
deflects for a very short time and then comes back to the original position.
3.
deflects and remains deflected as long as the battery is connected.
4.
deflects and gradually comes to the original position in a time which is large compared to the time constant.
Subtopic: Â Displacement Current |
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Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor:
| (a) | increases |
| (b) | decreases |
| (c) | does not change |
| (d) | is zero |
Choose the correct option:
1. (a), (b)
2. (b), (c)
3. only (c)
4. (a), (d)
Subtopic: Â Displacement Current |
 71%
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The speed of light depends:
| 1. | on elasticity of the medium only. |
| 2. | on inertia of the medium only. |
| 3. | on elasticity as well as inertia. |
| 4. | neither on elasticity nor on inertia. |
Subtopic: Â Properties of EM Waves |
 66%
From NCERT
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The average electric field associated with the plane electromagnetic wave \(\vec E = E_0 \hat {i} \sin (wt - kz)\) is:
1. \(E_0 \hat i\)
2. \(\dfrac {E_0} { \sqrt 2}\) \(\hat i \)
3. \(\sqrt 2E_0 \hat i\)
4. zero
1. \(E_0 \hat i\)
2. \(\dfrac {E_0} { \sqrt 2}\) \(\hat i \)
3. \(\sqrt 2E_0 \hat i\)
4. zero
Subtopic: Â Properties of EM Waves |
 55%
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The electric field of an electromagnetic wave is given by \(\overrightarrow E = E_0 \hat j \cos (\omega t - kx)+ E_0\hat i \sin (\omega t -kx)\).
The maximum value of the electric field in the wave is:
The maximum value of the electric field in the wave is:
| 1. | \(\dfrac {E_0} {\sqrt 2}\) | 2. | \(E_0\) |
| 3. | \(\sqrt 2 E_0\) | 4. | \(\sqrt 3 E_0\) |
Subtopic: Â Properties of EM Waves |
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The maximum electric field of a plane electromagnetic wave traveling through a vacuum is \(300~\text{V/m}.\) The maximum magnetic field of this wave is:
1. \(300~\text{T}\)
2. \(10^{-6}~\text{T}\)
3. \(9 \times 10^{10}~\text{T}\)
4. \(300\sqrt {2}~\text{T}\)
1. \(300~\text{T}\)
2. \(10^{-6}~\text{T}\)
3. \(9 \times 10^{10}~\text{T}\)
4. \(300\sqrt {2}~\text{T}\)
Subtopic: Â Properties of EM Waves |
 88%
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Consider the following statements:
| Statement I: | Charged particles which undergo acceleration or deceleration radiate their energy away. |
| Statement II: | Therefore, charged particles moving in circular paths in a uniform magnetic field should also radiate their energy. |
| 1. | Statement I is true, Statement II is true and Statement I implies Statement II. |
| 2. | Statement I is true, Statement II is true and Statement I does not imply Statement II. |
| 3. | Statement I is true, Statement II is false. |
| 4. | Statement I is false, Statement II is true. |
Subtopic: Â Generation of EM Waves |
 51%
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An electromagnetic waveform given by \(\vec{E}=E_{0} \hat{j} \sin \omega t\cos k x\) is set up in a certain region of space, where \(\vec{E}\) represents the electric field. The magnetic field associated with this waveform oscillates along the direction of:
| 1. | \(\hat {i}\) | 2. | \(\hat {j}\) |
| 3. | \(\hat{k} \) | 4. | \(\hat{j} + \hat{k}\) |
Subtopic: Â Properties of EM Waves |
 74%
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A plane electromagnetic wave is given by its electric field: \(\vec {E}=\vec {E_0}\cos\dfrac{\omega}{c}(ct-\beta x)\)
where \(\omega\) and \(\beta\) are constants, \(t\) is the time and \(x\) represents the \(x\text-\)coordinate. \(c\) is the speed of the light in vacuum.
The value of \(\beta,\)
where \(\omega\) and \(\beta\) are constants, \(t\) is the time and \(x\) represents the \(x\text-\)coordinate. \(c\) is the speed of the light in vacuum.
The value of \(\beta,\)
| 1. | cannot be less than \(1\). |
| 2. | equals \(1\), always. |
| 3. | cannot be greater than \(1\). |
| 4. | can be any non-zero value. |
Subtopic: Â Properties of EM Waves |
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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: Â Generation of EM Waves |
 66%
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