Answer: 9 × 10⁹ N.
- A 9 × 10⁹ N
- B 9 N
- C 1 N
- D 9 × 10⁻⁹ N
Correct answer: A. 9 × 10⁹ N
Explanation: F = kq₁q₂/r² = 9 × 10⁹ × 1 × 1 / 1² = 9 × 10⁹ 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.