A particle of mass 50 g is kept on the surface of a uniform sphere of mass 120 kg and radius 50 cm. Find the work to be done (in x 10-10 joule) against the gravitational force between them to take the particle far away from the sphere. Take .
Now, initial potential energy of the system of sphere and particle,
When the particle is far away from the sphere, the potential energy of the system will be zero i.e.,
Therefore, required work done,
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