A parallel plate capacitor is charged by connecting it to a battery through a resistor. If \(i\) is the current in the circuit, then in the gap between the plates:
1. displacement current of magnitude equal to \(i\) flows in the same direction as \(i\).
2. displacement current of magnitude equal to \(i\) flows in a direction opposite to that of \(i\).
3. displacement current of magnitude greater than \(i\) flows but can be in any direction.
4. there is no current.
Subtopic:  Displacement Current |
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From NCERT
NEET - 2024
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The property which is not of an electromagnetic wave travelling in free space is that:
1. the energy density in electric field is equal to energy density in magnetic field.
2. they travel with a speed equal to \(\dfrac{1}{\sqrt{\mu_0~ \varepsilon_0}} .\)
3. they originate from charges moving with uniform speed.
4. they are transverse in nature.
Subtopic:  Properties of EM Waves |
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From NCERT
NEET - 2024
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If \(\vec{E}\) and \(\vec{B}\) represent the electric field vector and magnetic field vector, respectively, in an electromagnetic wave then the direction of EM wave is along:
1. \(\vec{E}\)
2. \(\vec{B}\)
3. \(\vec{E}\times\vec{B}\)
4. \(\vec{B}\times\vec{E}\)
Subtopic:  Properties of EM Waves |
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From NCERT
NEET - 2024
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Match List-I with List-II (the symbols carry their usual meaning).
List-I List-II
A. \( \oint \vec{E} \cdot d \vec{A}=\dfrac{Q}{\varepsilon_0}\) I. Ampere-Maxwell's Law
B. \( \oint \vec{B} \cdot d \vec{A}=0 \) II. Faraday's Law
C. \( \oint \vec{E} \cdot d\vec{ l}=\dfrac{-d(\phi)}{d t} \) III. Gauss Law of electrostatics
D. \( \oint \vec{B} \cdot d\vec{l}=\mu_0 i_c+ \mu_0 \varepsilon_0 \dfrac{d\left(\phi_E\right)}{d t}\) IV. Gauss's law of magnetism

Choose the correct answer from the options given below:
1. A-III, B-IV, C-II, D-I
2. A-IV, B-III, C-II, D-I
3. A-III, B-II, C-IV, D-I
4. A-IV, B-I, C-III, D-II
Subtopic:  Maxwell's Equations |
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From NCERT
NEET - 2024
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The electromagnetic radiation which has the smallest wavelength is:
1. X-rays
2. Gamma rays
3. Ultraviolet rays
4. Microwaves
Subtopic:  Electromagnetic Spectrum |
 72%
From NCERT
NEET - 2024
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If the ratio of relative permeability and relative permittivity of a uniform medium is \(1 : 4.\) The ratio of the magnitudes of electric field intensity \((E)\) to the magnetic field intensity \((H)\) of an EM wave propagating in that medium is:
\(\left(\text{Given that}\sqrt{\frac{\mu_0}{\varepsilon_0}}=120\pi\right)\)
1. \(30\pi:1\)
2. \(1:120\pi\)
3. \(60\pi:1\)
4. \(120\pi:1\)
Subtopic:  Properties of EM Waves |
From NCERT
NEET - 2024
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In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of \(2.0\times 10^{10}~ \text{Hz}\) and amplitude \(48~\text{Vm}^{-1}\). Then the amplitude of the oscillating magnetic field is: (Speed of light in free space \(3\times 10^{8}~ \text{ms}^{-1}\))
1. \(1.6 \times 10^{-6} ~\text{T}\)
2. \(1.6 \times 10^{-9} ~\text{T}\)
3. \(1.6 \times 10^{-8} ~\text{T}\)
4. \(1.6 \times 10^{-7} ~\text{T}\)
Subtopic:  Properties of EM Waves |
 59%
From NCERT
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. \(2\)
Subtopic:  Properties of EM Waves |
 78%
From NCERT
NEET - 2023
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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%
From NCERT
NEET - 2023
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Match List - I with List - II.
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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