Answer: pE sin(theta).
- A pE
- B pE sin(theta)
- C pE cos(theta)
- D p/E
Correct answer: B. pE sin(theta)
Explanation: Torque tau = pE sin(theta), where theta is the angle between dipole moment and field direction.
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.