Question

Why must electrostatic field at the
surface of a charged conductor be
perpendicular to every point on it?​

Answer 1

Answer:

Electric field is defined to be the gradient of potential and the surface of a conductor has a constant potential. Therefore, there is no field along the surface of the conductor and hence, the elctrostatic field at the surface of a charged conductor should be normal to the surface at every point.

Answer 2

Answer:

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Explanation:

So that tangent on charged conductor gives the direction of the electric field at that point.