Answer: dipole.
- A dipole
- B monopole
- C quadrupole
- D conductor
Correct answer: A. dipole
Explanation: Two equal opposite charges close together form a dipole.
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.