A particle of mass 10g is kept on the surface of a uniform sphere of mass 100 kg and radius 10 cm. Find the work to done against the gravitational force between them to take the particle is away from the sphere.

Explanation

`U = (-GMm)/R = (-6.67 xx10^(-11) xx 100 xx 10 xx 10^(-3))/(10 xx 10^(-2))`
`U = 6.67 xx10^(-10)J `
So , the maount of work done to take the particle upto infinite will be ` 6 . 67 xx10^(-10)` J