Answer: pE.
- A pE
- B 2pE
- C zero
- D pE/2
Correct answer: A. pE
Explanation: W = U<sub>perp</sub> − U<sub>parallel</sub> = 0 − (−pE) = pE.
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.