By keeping a conductor in an external electric field and from the results obtained by electrostatics,which of the following options is wrong?

  • A
    Inside a conductor,the electrostatic field is zero.
  • B
    The interior of the conductor has excess charge in a static situation.
  • C
    At the surface of a charged conductor,the electric field must be perpendicular to the surface.
  • D
    The electrostatic potential is constant throughout the volume of the conductor.

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