Two particles, one with a charge $-7\mathrm{.}13$x$10^-6$ and the other charge $1\mathrm{.}87$x$10^-6$ are $\mathrm{.}0434$ m apart. What is the magnitude of F of the force that one exerts on the other. Two new particles with identical positive charge q$3$ are place $\mathrm{.}0434$ m apart. The force between them is measured to be the same as that between the original particles. What is q$3$