An equipotential surface in any electric field is:
AAt 45° to the field lines
BParallel to the field lines
CPerpendicular to the field lines at every point
DTangential to the field lines
Answer & Solution
Correct answer: C. Perpendicular to the field lines at every point
Along an equipotential, $dV=0$ so $\vec E \cdot d\vec x = 0$, i.e. $\vec E \perp d\vec x$. Therefore the field is always normal to an equipotential surface.
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