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 |
54%
From NCERT
NEET - 2024
Hints

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 |
65%
From NCERT
NEET - 2024
Hints

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 |
84%
From NCERT
NEET - 2024
Hints

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. $$\oint \vec{E} \cdot \overrightarrow{d I}=\dfrac{-d(\phi)}{d t}$$ III. Gauss Law of electrostatics D. $$\oint \vec{B} \cdot \overrightarrow{d l}=\mu_0 i_c+ \mu_0 \varepsilon_0 \dfrac{d\left(\phi_E\right)}{d t}$$ 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 |
77%
From NCERT
NEET - 2024
Hints

The electromagnetic radiation which has the smallest wavelength is:
1. X-rays
2. Gamma rays
3. Ultraviolet rays
4. Microwaves
Subtopic:  Electromagnetic Spectrum |
75%
From NCERT
NEET - 2024
Hints

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
Hints

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 |
58%
From NCERT
NEET - 2023
Hints

$$\varepsilon_0$$ 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
Hints

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
Hints

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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Hints
To view explanation, please take trial in the course.
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