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Q. Assertion There is no potential difference between any two points on the equipotential surface.
Reason No work is required to move a test charge on the equipotential surface from one point to other.

Electrostatic Potential and Capacitance

Solution:

The proof of this statement is simple. There is no potential difference between any two points on the surface and no work is required to move a test charge on the surface because work done $=$ potential difference $\times$ charge.