Red blood cells can often be charged. Consider two red blood cells with the following charges: $16\mathrm{.}8$ pC and $+51\mathrm{.}8$ pC$.$ The red blood cells are $3\mathrm{.}26$ cm apart. $(1$ pC $=11012$ C$.)$

$($a$)$ What is the magnitude of the force on each red blood cell?

$($b$)$ The red blood cells come into contact with each other and then are separated by $3\mathrm{.}26$ cm$.$ What magnitude of force does each of the red blood cells now experience?