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How much work has to be done in assembling three charged particles at the vertices of an equilateral triangle as shown in figure

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Amount of workdone in assembling the charges is equal to the net potential energy
` So, P.E.=V_(12)+V_(13)+V_(23) `
` =(9xx10^3)/10^-1xx10^-10 `
` [4xx2+4xx3+3xx2] `
` 9xx(8+12+6) `
` 9xx26=234J `
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