Answer: -1.6 x 10 -19 C.
- A +1.6 x 10<sup>-19</sup> C
- B -1.6 x 10<sup>-19</sup> C
- C +1.6 x 10<sup>-9</sup> C
- D -9.1 x 10<sup>-31</sup> C
Correct answer: B. -1.6 x 10<sup>-19</sup> C
Explanation: An electron carries charge -e = -1.6 x 10<sup>-19</sup> C. Proton has charge +1.6 x 10<sup>-19</sup> C.
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.