A particle of mass 10 g is kept on the surface of a uniform sphere of mass 100 kg and radius 10 cm. Find the work to be done against the gravitational force between them to take the particle far away from them
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Updated on : 2022-09-05
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Correct option is D)
To take the particle far away from the sphere implies the gravitational potential is zero at that point, i.e. distance is infinite. So, the work done is change in gravitational potential. W=δU=0−(−rGMm)=rGMm W=0.16.67×10−11×100×0.01=6.67×10−10J Option D.