5. Which of the following statements is correct?
(A) The surface charge density of a perfect conductor must be uniform.
(B) The electric field line is the trajectory of a charged particle under electric field. (C) The conductor can be thought of as a dielectric material with dielectric constant
k=0.
(D) If the electric potential at some position is zero, the electric field at that position
must also be zero.
(E) The surface of a perfect conductor is an equipotential surface.
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