Answer: Q/epsilon0.
- A Q/epsilon0
- B -Q/epsilon0
- C Zero
- D Depends on shape of surface
Correct answer: A. Q/epsilon0
Explanation: Gauss's law: flux = Qenclosed/epsilon0, regardless of the shape or size of the closed 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.