Two concentric shells have masses M and m and their radii are R and r, respectively, where R>r. If x is the distance from the common centre, then what is the gravitational potential at a point for which r<x<R?
−G[Mx+mr]
−G[Mx−mr]
−G[MR+mx]
−G[MR−mx]
A
−G[Mx+mr]
B
−G[MR+mx]
C
−G[MR−mx]
D
−G[Mx−mr]
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