Two tiny conducting spheres are identical and carry charges of $-23\mathrm{.}1\backslash$mu C and $+41\mathrm{.}4\backslash$mu C$.$ They are separated by a distance of $2\mathrm{.}85$ cm$.($a$)$ What is the magnitude of the force that each sphere experiences? $($b$)$ The spheres are brought into contact and then separated to a distance of $2\mathrm{.}85$ cm$.$ Determine the magnitude of the force that each sphere now experiences.