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Find the PE of three objects of masses 1 kg, 2 kg and 3 kg placed at the three vertices of anequilateral triangle of side 10 cm (G is universal gravitational constant)

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50GJ

$- 55 G J$

$- 110 G J$

$- 120 G J$

answer is C.

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Detailed Solution

$U = \frac{- G m_{1} m_{2}}{r} U = \frac{- G}{r} [1 \times 2 + 2 \times 3 + 3 \times 1] U = \frac{- G}{10 \times 10^{- 2}} \times 11 = - 110 G J$

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