# Illustration Electric field at the conductive surface

A conducting surface (e.g. of a metallic conductor) with free-moving surface charges (electrons). In addition, a electric field vector $$\boldsymbol{E}$$ is drawn in at a point on the surface pointing in arbitrary direction.
This field vector was split into the perpendicular component $$\boldsymbol{E}_{\perp}$$ and a parallel component $$\boldsymbol{E}_{||}$$. However, the perpendicular component disappears because the surface charges move along the surface until $$\boldsymbol{E}_{||} = 0$$. Only the perpendicular field component $$\boldsymbol{E}_{\perp}$$ remains. So field lines always come out perpendicularly from the conducting surfaces!