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Why are equipotential lines near the insulator surface perpendicular to the surface?

April 26, 2017equipotential insulator Mathematics near perpendicular Physics

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Why are equipotential lines near the insulator surface perpendicular to the surface?

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Because the potential in the region around the surface is the same for anywhere along the surface if it the same distance away. Drawing a line through all of these points with equal potential would be a parallel line, because all points are equal distance from the surface.