Answer: sigma / epsilon0.
- A sigma / epsilon0
- B 2 sigma / epsilon0
- C sigma / (2 epsilon0)
- D sigma x epsilon0
Correct answer: A. sigma / epsilon0
Explanation: E = sigma/epsilon0 just outside a conductor surface, perpendicular to the surface.
Field lines always point from positive to negative charge, are denser where the field is stronger, and never cross; an isolated positive charge has lines radiating symmetrically outward, while a dipole's lines curve from the positive to the negative charge.
Concept context
Coulomb's law, electric field, potential, capacitors, Gauss's law.