potential due to a point charge at distance r is given as
V = k q / r
Net potential at A:
VA = [ (9 x 10^9) (-5.7 x 10^-6) / (0.08)] + [ (9 x 10^9) (8.2 x 10^-6) / (0.15)] + [ (9 x 10^9) (3 x 10^-6) / sqrt(.08^2 + 0.15^2)]
VA = - 641250 + 492000 + 158823.5
VA = 9573.5 volt
At B:
VB = [ (9 x 10^9) (-5.7 x 10^-6) / sqrt(0.08^2 + 0.05^2)] + [ (9 x 10^9) (8.2 x 10^-6) / (0.10)] + [ (9 x 10^9) (3 x 10^-6) / sqrt(.08^2 + 0.10^2)]
VB = - 543779 + 738000 + 210834.6
VB = 405055.6 volt
VB - VA = 395482 Volt Or 395.5 kV
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