What is the electrostatic potential energy of the system? Calculate the electric potential at the origin (0,0) due to the four charges.
a) (a) 9.0×10³J ,(b)1.5×10³V
b) (a)7.2×10³J, (b)1.2×10³V
c) (a) 6.4×10³J, (b)1.1×10³V
d) (a)5.6×10³J, (b)0.9×10³V