Assertion: No work is done in moving a test charge from one point to another over an equipotential surface.
Reason: Electric field is always normal to the equipotential surface at every point.
Solution:
Since potential is constant on an equipotential surface, the work done in moving a charge is zero \(W = q \Delta V = 0\). This is because the electric field is always perpendicular to the displacement along the surface \(\vec{E} \cdot d\vec{r} = 0\).
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