Answer: 6.25 × 10¹⁸.
- A 6.25 × 10¹⁸
- B 6.02 × 10²³
- C 1.6 × 10⁻¹⁹
- D 9 × 10⁹
Correct answer: A. 6.25 × 10¹⁸
Explanation: n = 1 / (1.6 × 10⁻¹⁹) ≈ 6.25 × 10¹⁸ electrons.
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.