Answer: 0.60 N.
- A 0.60 N
- B 0.30 N
- C 1.80 N
- D 6.00 N
Correct answer: A. 0.60 N
Explanation: Using F = kq<sub>1</sub>q<sub>2</sub>/r<sup>2</sup>, F = 9 × 10<sup>9</sup> × 2 × 10<sup>-6</sup> × 3 × 10<sup>-6</sup>/0.3<sup>2</sup> = 0.60 N.
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.