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Three particles cach having a mass of 100 gm are placed on the vertices of an equilateral triangle of side \( 20 \mathrm{~cm} \). The work done in increasing the side of the triangle to \( 40 \mathrm{~cm} \) is \( \left[G=6.67 \times 10^{-11} \frac{\mathrm{N}-\mathrm{m}^{2}}{\mathrm{~kg}^{2}}\right] \)
(A) \( 5.0 \times 10^{-12} \mathrm{~J} \)
(B) \( 2.25 \times 10^{-10} \mathrm{~J} \)
(C) \( 4.0 \times 10^{-11} \mathrm{~J} \)
(D) \( 6.0 \times 10^{-15} \mathrm{~J} \)
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