Question

Two small uncharged metal spheres are separated by $10$m in vacuum. ${10}^3$ electrons are transferred from one sphere to another. Find the electrostatic force between the spheres, treating them as particles.

Answer 1

Each electron charge of$-1.6\times {10}^{-19}c=(3.5\times {10}^{12})\left(\frac{-1.6\times {10}^{-19}}{1}\right)=5.7\times {10}^{-7}c$

$F=\frac{k.\left|q1\right|\left|q2\right|}{r^2}=\frac{(9\times {10}^9){(5.6\times {10}^{-7})}^2}{2^2}=7.056\times {10}^{-4}N$