Answer: sigma / epsilon0.
- A sigma x A / epsilon0
- B sigma / epsilon0
- C sigma / (2 epsilon0)
- D 2 sigma / epsilon0
Correct answer: B. sigma / epsilon0
Explanation: For infinite parallel plates: E = sigma/epsilon0. Each plate gives sigma/(2epsilon0); combined = sigma/epsilon0.
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.