A particle of mass 10gm is kept on the surface of a uniform sphere of mass 100kg and radius 10cm. Find the work done against the gravitational force between them, to take the particle far away from the sphere. (G=6.67×10−11Nm2/Kg2)
A
3.33×10−9J
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
3.33×10−10J
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
6.67×10−9J
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
6.67×10−10J
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution
The correct option is C6.67×10−10J At infinity, the gravitational potential energy of the system will be 0.
Initially, the particle is outside sphere and hence sphere will behave as point object at its centre,
Therefore,
E0=−GMmR=−(6.67×10−11)×(100)×(0.01)0.1=−6.67×10−10J We know that, W=ΔU=Uf−Ui⟹W=−Ui