일반물리학 2 — Coulomb's Law: Problem 18

18 Two tiny, spherical water drops, with identical charges of \(-1.00 \times 10^{-16}\text{ C}\), have a center-to-center separation of \(1.20\text{ cm}\). (a) What is the magnitude of the electrostatic force acting between them? (b) How many excess electrons are on each drop, giving it its charge imbalance?