Three point charges 3 nC , 6 nC and 9 nC are placed at the corners of an equilateral triangle of side `0.1` m . The potential energy of the system is

Options

A. 8910J
B. 89100J
C. 9910J
D. 99100J

Explanation

`U= (1)/(4pi in_(0)) [(q_(1)q_(2))/(r_(12))+ (q_(2)q_(3))/(r_(23))+ (q_(1)q_(3))/(r_(13))]`
`rArr U= (9 xx 10^(9))/(0.1) [3 xx 6+ 6 xx 9 + 3 xx 9] xx 10^(-18) = 8910 xx 10^(-19)J= 8.9 1mu J`
(All options in the question are wrong, the right solution is given here)