Answer: sigma / epsilon 0.
- A sigma / epsilon<sub>0</sub>
- B 2 sigma / epsilon<sub>0</sub>
- C sigma / (2 epsilon<sub>0</sub>)
- D sigma x epsilon<sub>0</sub>
Correct answer: A. sigma / epsilon<sub>0</sub>
Explanation: E = sigma/epsilon<sub>0</sub> 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.