Two particles, one with charge $-2\mathrm{.}93{10}^{-6}C$ and the other with charge $5\mathrm{.}23{10}^{-6}C,$ are $0\mathrm{.}0509m$ apart. What is the magnitude of the force that one particle exerts on the other?

magnitude of force:

Two new particles with identical positive charge $q_3$ are placed the same $0\mathrm{.}0509m$ apart. The force between them is measured to be the same as that between the original particles. What is $q_3?$

$q_3=$