Question

Two equal charges , Q1 and Q2, separated by a distance r, experience an electrostatic force F. What is the new force F if the distance between the two charges becomes (a) 2r; (b) 3r; (c) r/2; (d) r/3

Answer 1

$F=\frac{kQ_1Q_2}{r^2},~F$ ~ $\frac{1}{r^2},$

a) $\frac F4$

b) $\frac F9$

c) $4F$

d) $9F$