Question

A proton is located at the point (x = 1.0 nanometres, y = 0.0 nanometres) and an electron is

located at the point (x = 0.0 nanometres, y = 4.0 nanometres). Find the magnitude of the

electrostatic force that each one exerts on the other. (k = 1/4πε0 = 9.0 × 109 N ∙ m2/C2, e = 1.6

× 10-19 C)

Answer 1

$F=\frac{kpe}{r^2}=-13.6~pN.$