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12th Uttar Pradesh Board
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According to Maxwell's hypothesis, changing electric field gives rise to

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Important Questions on Electromagnetic Waves

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12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 8 - Electromagnetic Waves>Exercise>Q 2
Which among the following does not represent Maxwell’s equation?
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12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 8 - Electromagnetic Waves>Exercise>Q 3
A plane electromagnetic wave of frequency 25 MHz travels in free space along x-direction. At a particular point in space and time, electric field E=6.3 V m-1. The magnitude of magnetic field B at this point is
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12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 8 - Electromagnetic Waves>Exercise>Q 4
The amplitude of the magnetic field of a harmonic electromagnetic wave in vacuum is B0=510 nT. The amplitude of the electric field part of the wave is
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12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 8 - Electromagnetic Waves>Exercise>Q 5
An electromagnetic wave is propagating along x -axis. At x=1 m and t=10 s, its electric vector |E→|=6 V/m, then the magnitude of its magnetic vector is
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12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 8 - Electromagnetic Waves>Exercise>Q 11
A potential difference of 30 V is applied between the ends of a conductor of length 100 m and resistance 0.5 Ω and uniform area of cross-section. The total linear momentum of free electrons is
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12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 8 - Electromagnetic Waves>Exercise>Q 15
The charge on a parallel plate capacitor is varying as q=q0sin2πnt. The plates are very large and close together. Neglecting the edge effects, the displacement current through the capacitor is:
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12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 8 - Electromagnetic Waves>Exercise>Q 17
Sea water at frequency ν=4×108 Hz has permittivity ε≈80 εo, permeability µ≈µo and resistivity ρ=0.25 Ω–m. Imagine a parallel plate capacitor immersed in sea water and driven by an alternating voltage source V(t) = Vo sin (2πνt). What fraction of the conduction current density is the displacement current density?
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12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 8 - Electromagnetic Waves>Exercise>Q 21
One requires 11 eV of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in