1.

Three point charges 3 nC , 6 nC and 9 nC are placed at the corners of an equilateral triangle of side0.1 m . The potentialenergy of the systemis

Answer»

8910J
89100J
9910J
99100J

Solution :`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)


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