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From a solid sphere of mass M and radius R, a spherical portion of radius 2 R is removed, as shown in the figure. Taking gravitational potential V = 0 at r = ∞ , the potential at the centre of the cavity thus formed is - (G = gravitational constant)

1. R 2 GM −
2. R GM −
3. R 3 GM 2 −
4. R GM 2 −

Correct answer: R GM −

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