Question

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

Answer 1

Answer:

Electric field is defined as 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 electrostatic 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.