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Q. No.A parallel plate capacitor is charged by connecting it to a battery through a resistor. If ii is the current in the circuit, then in the gap between the plates:
| 1. | A displacement current of magnitude equal to i flows in the same direction as i. |
| 2. | A displacement current of magnitude equal to i flows in the opposite direction to i. |
| 3. | A displacement current of magnitude greater than i flows but it can be in any direction. |
| 4. | There is no current. |
Subtopic: Displacement Current |
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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 1√μ0 ε0. |
| 3. | they originate from charges moving with uniform speed. |
| 4. | they are transverse in nature. |
Subtopic: Properties of EM Waves |
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NEET - 2024
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If →E and →B represent the electric field vector and magnetic field vector, respectively, in an electromagnetic wave then the direction of EM wave is along:
1. →E
2. →B
3. →E×→B
4. →B×→E
1. →E
2. →B
3. →E×→B
4. →B×→E
Subtopic: Properties of EM Waves |
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NEET - 2024
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Match List-I with List-II (the symbols carry their usual meaning).
Choose the correct answer from the options given below:
| List-I | List-II | ||
| A. | ∮→E⋅d→A=Qε0 | I. | Ampere-Maxwell's law |
| B. | ∮→B⋅d→A=0 | II. | Faraday's law |
| C. | ∮→E⋅d→l=−d(ϕ)dt | III. | Gauss's law of electrostatics |
| D. | ∮→B⋅d→l=μ0ic+μ0ε0d(ϕE)dt | 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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NEET - 2024
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Among the various types of electromagnetic radiation, the one with the smallest wavelength is:
| 1. | X-rays | 2. | Gamma rays |
| 3. | Ultraviolet rays | 4. | Microwaves |
Subtopic: Electromagnetic Spectrum |
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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:
(Given that√μ0ε0=120π)
1. 30π:1
2. 1:120π
3. 60π:1
4. 120π:1
(Given that√μ0ε0=120π)
1. 30π:1
2. 1:120π
3. 60π:1
4. 120π:1
Subtopic: Properties of EM Waves |
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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 2.0×1010 Hz and amplitude 48 Vm−1. Then the amplitude of the oscillating magnetic field is: (Speed of light in free space 3×108 ms−1)
1. 1.6×10−6 T
2. 1.6×10−9 T
3. 1.6×10−8 T
4. 1.6×10−7 T
1. 1.6×10−6 T
2. 1.6×10−9 T
3. 1.6×10−8 T
4. 1.6×10−7 T
Subtopic: Properties of EM Waves |
61%
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NEET - 2023
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ε0 and μ0 are the electric permittivity and magnetic permeability of free space respectively. If the corresponding quantities of a medium are 2ε0 and 1.5μ0 respectively, the refractive index of the medium will nearly be:
1. √2
2. √3
3. 3
4. 2
1. √2
2. √3
3. 3
4. 2
Subtopic: Properties of EM Waves |
80%
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NEET - 2023
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To produce an instantaneous displacement current of 2 mA in the space between the parallel plates of a capacitor of capacitance 4 μF, the rate of change of applied variable potential difference (dVdt) must be:
1. 800 V/s
2. 500 V/s
3. 200 V/s
4. 400 V/s
1. 800 V/s
2. 500 V/s
3. 200 V/s
4. 400 V/s
Subtopic: Displacement Current |
79%
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NEET - 2023
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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 m |
| (b) | Microwaves | (ii) | 102 m |
| (c) | Infrared radiation | (iii) | 10−2 m |
| (d) | X-rays | (iv) | 10−4 m |
| (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 |
73%
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NEET - 2022
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