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Q. No.To produce an instantaneous displacement current of \(2~\text{mA}\) in the space between the parallel plates of a capacitor of capacitance \(4~\mu\text{F}\), the rate of change of applied variable potential difference \(\left(\frac{dV}{dt}\right)\) must be:
1. \( 800~ \text{V} / \text{s} \)
2. \( 500~ \text{V} / \text{s} \)
3. \( 200~ \text{V} / \text{s} \)
4. \( 400 ~\text{V} / \text{s}\)
Subtopic: Displacement Current |
77%
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NEET - 2023
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\(\varepsilon_0\) and \(\mu_0\) are the electric permittivity and magnetic permeability of free space respectively. If the corresponding quantities of a medium are \(2\varepsilon_0\) and \(1.5\mu_0\) respectively, the refractive index of the medium will nearly be:
1. \(\sqrt2\)
2. \(\sqrt3\)
3. \(3\)
4. \(2\)
1. \(\sqrt2\)
2. \(\sqrt3\)
3. \(3\)
4. \(2\)
Subtopic: Properties of EM Waves |
78%
From NCERT
NEET - 2023
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An electromagnetic wave of frequency \(\nu=3.0\) MHz passes from vacuum into a dielectric medium with relative permittivity \(\epsilon =4.0\) Then:
| 1. | wavelength is doubled and frequency becomes half. |
| 2. | wavelength is halved and frequency remains unchanged. |
| 3. | wavelength and frequency both remain unchanged. |
| 4. | wavelength is doubled and frequency unchanged. |
Subtopic: Properties of EM Waves |
71%
From NCERT
NEET - 2013
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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 |
62%
From NCERT
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When light propagates through a material medium of relative permittivity, \(\epsilon_{r}\) and relative permeability, \(\mu_{r}\) the velocity of light, \(v\) is given by:
(\(c\) = velocity of light in vacuum)
1. \(v=\frac{{c}}{\sqrt{\epsilon_{r} \mu_{{r}}}}\)
2. \(v={c}\)
3. \(v=\sqrt{\frac{\mu_{{r}}}{\epsilon_{{r}}}}\)
4. \(v=\sqrt{\frac{\epsilon_{{r}}}{\mu_{{r}}}}\)
(\(c\) = velocity of light in vacuum)
1. \(v=\frac{{c}}{\sqrt{\epsilon_{r} \mu_{{r}}}}\)
2. \(v={c}\)
3. \(v=\sqrt{\frac{\mu_{{r}}}{\epsilon_{{r}}}}\)
4. \(v=\sqrt{\frac{\epsilon_{{r}}}{\mu_{{r}}}}\)
Subtopic: Properties of EM Waves |
85%
From NCERT
NEET - 2022
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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 |
72%
From NCERT
NEET - 2022
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When an electromagnetic wave of frequency \(f_0\) undergoes refraction at the interface of two transparent (non-absorbing) media, the frequency of the transmitted wave is \(f_t.\) Then:
1. \(f_t=f_0\)
2. \(f_t>f_0\)
3. \(f_t<f_0\)
4. \(f_t\neq f_0\)
1. \(f_t=f_0\)
2. \(f_t>f_0\)
3. \(f_t<f_0\)
4. \(f_t\neq f_0\)
Subtopic: Properties of EM Waves |
72%
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:
1. \(2\)
2. \(\sqrt2\)
3. \(4\)
4. \(2\sqrt2\)
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 |
62%
From NCERT
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A plane electromagnetic waveform given by: \(\overrightarrow E_1=E_0\hat j\sin(\omega t-kx)\)
propagates along the \(x\)-axis. A second waveform given by: \(\overrightarrow E_2=E_0\hat k\sin(\omega t-kx)\)
is also allowed to propagate. The magnetic field has the amplitude: (Assume speed of light in vacuum is \(c\))
1. \(\frac{E_0}{c}\)
2. \(\frac{E_0}{2c}\)
3. \(\frac{\sqrt2E_0}{c}\)
4. zero
propagates along the \(x\)-axis. A second waveform given by: \(\overrightarrow E_2=E_0\hat k\sin(\omega t-kx)\)
is also allowed to propagate. The magnetic field has the amplitude: (Assume speed of light in vacuum is \(c\))
1. \(\frac{E_0}{c}\)
2. \(\frac{E_0}{2c}\)
3. \(\frac{\sqrt2E_0}{c}\)
4. zero
Subtopic: Properties of EM Waves |
66%
From NCERT
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Which of the following situation(s), can cause the radiation of an electromagnetic wave?
| (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 |
| 1. | only (A) |
| 2. | only (B) |
| 3. | only (A) & (B) |
| 4. | (A), (B), (C) |
Subtopic: Generation of EM Waves |
64%
From NCERT
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