Two charges of 14µC and -4µC are placed at (-12 cm, 0, 0) and (12cm, 0, 0) in an external electric field E=(B/r²), where B=1.2×10^6 N/(cm²) and r is in metres. The electrostatic potential energy of the configuration is
a) 97.9 J
b) 102.1 J
c) 2.1 J
d) -97.9 J
