Answer: Perpendicular.
- A Parallel
- B Perpendicular
- C At 45 degrees
- D Identical
Correct answer: B. Perpendicular
Explanation: Equipotential surfaces are always perpendicular to electric field lines. No work is done moving a charge along an equipotential.
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.