CBSE 2025 · Region 4 · Set 2 · Q2 · 1 mark
When the switch of the circuit is turned on, the filament of the bulb glows instantaneously because :
Official answer
From CBSE’s own marking scheme for this paper.
(C)
electric field is established instantaneously across the filament which pushes the electrons.
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CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.