What is gravitational potential energy of system consisting of two concentric spherical shells of mass, m, and 4 m and radii R and 2R.

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−2Gm2R

−9Gm22R

−5Gm22R

−13Gm22R

answer is D.

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Detailed Solution

Total energy equals sum of self energy of two shells and their mutual energy.self energy-Gm22R-G16m24R and mutual potential energy -G4mm2R

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