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Physics · 2025 · 3 marks
CBSE 2025 · Region 4 · Set 1 · Q25
(a) State any three characteristics of electromagnetic waves. (b) Briefly explain how and where the displacement current exists during the charging…
(a)
State any three characteristics of electromagnetic waves.
(b)
Briefly explain how and where the displacement current exists during the charging of a capacitor.
Marking-scheme solution
(a)
Electromagnetic wave carries energy.
Electromagnetic wave carries momentum.
Electromagnetic wave moves with velocity of light in vacuum.
In electromagnetic wave, electric field vector, magnetic field vector and direction of propagation are all mutually perpendicular.
Electromagnetic waves are transverse in nature.
Electromagnetic waves do not require a physical medium to propagate and can travel through a vacuum.
Electromagnetic waves consist of oscillating electric and magnetic fields.
(b)
During charging of a capacitor, the time varying electric field / electric flux between the plates of the capacitor induces the displacement current.
Displacement current exists between the plates of the capacitor.
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CBSE Class 12 Physics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.