Two identical point charges are kept a distance apart and repel each other with a force

PHYSICS · Subjective · CBSE · Physics · Electric Charges and Fields · Electric Charges and Fields

Problem

Two identical point charges are kept a distance

r

apart and repel each other with a force

F

. If the distance between them is reduced to

\dfrac{r}{3}

while the charges remain unchanged, by what factor will the force change?