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Physics · 2026 · 3 marks
CBSE 2026 · Region 2 · Set 3 · Q26
(a) Draw electric field lines and equipotential surfaces for a system of two equal positive charges separated by some distance. (b) Using the drawing…
(a)
Draw electric field lines and equipotential surfaces for a system of two equal positive charges separated by some distance.
(b)
Using the drawing in (a) above, explain that electric field need not be a constant over each point of an equipotential surface.
Marking-scheme solution
(a)
(b)
Different points on an equipotential surface might be at different distances from the source charge, so the electric field will not be constant at all points, as shown in the above diagram.
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CBSE Class 12 Physics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.