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normal lines or normals
As we know equipotential surface means there is no potential difference that is no work is done on surface.so lines of force must intersect surface at right angles to satisfy this statement,so that net work is zero.
Perpendicular lines meet at right angles
Lines that intersect right angles (ninety-degree angles) are described as perpendicular.
If two lines intersect at right angles then they are perpendicular!