Three identical particles each of mass m are placed at the corners of an equilateral triangle of side l. The work done by external force to increase the side of triangle from l to 2l is
A
−32GM2l
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B
−3GM2l
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C
32GM2l
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D
3GM2l
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Solution
The correct option is C32GM2l Work done W=ΔU=Uf−Vi =3(−GMM2l)−3(−GMMl) =32GM2l