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Equipotential surfaces

Uniform electric field of magnitude 100 V/m in space is directed along the line y = 3 + x. Find the potential difference between point (3, 1) & (1, 3)


Slope electric field lines m1 = 1 and slope of the line joining points (3,1) and (1,3) is m2=3-11-3 =-1.

Since m1×m2 =-1 ,the line joining the points must be an equipotential surface .

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