Discussion
Assertion: the field is normal to an equipotential surface. Reason: no work is done in moving a charge along such a surface.
Answer: C
Correct answer: both the assertion and the reason are true and the reason explains the assertion
Both are true and the reason gives the mechanism. Zero work along the surface means \( \mathbf{E}\cdot d\mathbf{l} = 0 \) for every displacement lying in it, which requires the field to have no component in the surface - that is, to be normal to it everywhere.
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