Identify the correct statements among the following.

(A) Inside a conductor, electrostatic field is non-zero
(B) Electrostatic potential is constant throughout the volume of the conductor and has the same value (as inside) on its surface
(C) In a conductor with a cavity, with no charges inside the cavity, the electric field inside the cavity is non-zero, whatever be the size and shape of the cavity
(D) At the surface of a charged conductor, electrostatic field must be normal to the surface at every point

Choose correct answer from the options given below:

(B) and (D) only

The correct answer is Option (3) → (B) and (D) only

(A) Incorrect — Inside a conductor in electrostatic equilibrium, the electric field is zero.

(B) Correct — Electrostatic potential is constant throughout the conductor, including its surface.

(C) Incorrect — In a cavity with no charges, the electric field inside is zero.

(D) Correct — At the surface of a charged conductor, the electric field is perpendicular (normal) to the surface.

Correct statements: (B), (D)