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(B) For a charged conductor in electrostatic equilibrium:$(1)$ The electric field just outside the surface of a conductor must be perpendicular to the

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$(2)$ and $(3)$

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(B) For a charged conductor in electrostatic equilibrium:$(1)$ The electric field just outside the surface of a conductor must be perpendicular to the surface, not parallel. Thus, statement $(1)$ is false.$(2)$ The electric field inside a conductor in electrostatic equilibrium is always zero $(E_{in} = 0)$. Thus, statement $(2)$ is true.$(3)$ Electric field lines are always perpendicular to an equipotential surface. Since the surface of a conductor is an equipotential surface, this statement is true. Thus, statement $(3)$ is true.Therefore, statements $(2)$ and $(3)$ are correct.

Which of the following statements is always true for a charged conductor?
$(1)$ The electric field just outside the surface is parallel to the surface.
$(2)$ $E_{in} = 0$
$(3)$ Electric field lines are perpendicular to the equipotential surface.

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Which of the following statements is always true for a charged conductor?$(1)$ The electric field just outside the surface is parallel to the surface.$(2)$ $E_{in} = 0$$(3)$ Electric field lines are perpendicular to the equipotential surface.