Q 12-01-009NEETJEE MainEasy
Two identical point charges repel each other with a force $F$ when $r$ apart. If the charge on each is doubled and the separation is halved, the force becomes
Answer: (A) $16F$
$F \propto \dfrac{q^2}{r^2}$: $\dfrac{(2)^2}{(1/2)^2} = 16$, so the force becomes $16F$.
Solution by Sreeraj P, M.Sc Physics