Two particles have unequal charges, one is +q and the other is -2q. The strength of the electrostatic force between these two stationary particles is equal to F. what happens of F if the distance between the particles is halved?

Options

A. It decreases by a factor of 4
B. it decreases by a factor of 2.
C. it remains the same.
D. it increases by a factor of 4.

Answer

D

Explanation

Since coulomb's law is an inverse-square law (that is, F is inversely proportional to `r^(2)`), if r decreases by a factor of 2, then F increases by a factor of `2^(2)=4`.