There are 3 point charges: q1=+4.0*10^-6 C, q2=+2.0*10^-6 C, q3=-3.0*10^-6 C.
a.) Find the electric potential at Points A and B.
b.) Find the electric potential energy of a -5.0nC charge placed at point A.
c.) If the charge placed at point A was +5.0nc instead of -5.0nC, what would it's potential Energy be? What electric potential would it then experience while at A?