A mass has a charge of q = 3e, where e is the charge on an electron. (a) Determine the electric potential (in V) due to the charge at a distance r = 0.180 cm from the charge. (b) Determine the electric potential difference (in V) between a point that is 3r away and this point, that is V(3r) - V(r). (c) Determine the electric potential difference (in V) between a point that is r/3 away and this point, that is V(r/3) - V(r).