Answer: kq/r².
- A kq/r²
- B kq/r
- C kqr itself
- D simply kq
Correct answer: A. kq/r²
Explanation: For a point charge, E = kq/r².
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.