Q.

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

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a

−2Gm2R

b

−9Gm22R

c

−5Gm22R

d

−13Gm22R

answer is D.

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Detailed Solution

Usys=Uself 1,+Uself 2,+Uinteraction =−Gm22R−12G(4m)22R−Gm4m2R​ =−13Gm22R
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