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Question: There is a concentric hole of radius R in a solid sphere of radius 2R. Mass of remaining portion is ...

There is a concentric hole of radius R in a solid sphere of radius 2R. Mass of remaining portion is M, then the gravitational potential at centre is

A

−5GM7R\frac { - 5 \mathrm { GM } } { 7 \mathrm { R } }

B

C

D

Answer

Explanation

Solution

Potential at centre due to a solid sphere of radius r and mass m is

v = −3Gm2r- \frac { 3 \mathrm { Gm } } { 2 \mathrm { r } }

Here required potential

=