Electric field $\vec{E}$ at the surface of charged conductor is:

A. $|\vec{E}|=\frac{\sigma}{\varepsilon_0}$
B. $\vec{E}$ has a tangential component
C. Electric field is zero everywhere inside the conductor.
D. Any excess charge must reside on the surface of the conductor.

Choose the correct answer from the options given below:

A, C and D only

The correct answer is Option (4) → A, C and D only

(A) The electric field at the surface of a charged conductor is -

$|E|=\frac{σ}{ε_0}$

(C) In electrostatic equilibrium, the electric field inside a conductor is always zero, if there were field inside, free charges would move until it become nullity.

(D) In electrostatic any excess charge on a conductor radistributes itself to reside on the surface to minimize repulsion.