How far part the two electrons be, if the force between them equals the weight of an electrons?
me=9.1×10−31kg
e=1.6×10−19C
F=mg and
F=14πε0q1q2r2
9.1×10−31×10=9×109×(1.6×10−19)2r2
r2=9×109×1.6×10−19×1.6×10−19×1.6×10−199.1×10−30
r2=23.04×109.1
r3=230.49.1=25.319
r=√25.39=5.032m.
r≈5m