A particle of mass m is located outside a uniform sphere of mass M at a distance r from its centre. Find the potential energy of gravitational interaction of the particle and the sphere.
−2GMmr
−GMm3r
−GMmr
−GMm2r
A
−2GMmr
B
−GMm2r
C
−GMmr
D
−GMm3r
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Solution
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Since for a uniform solid sphere,
VG=−GMr for r
and it is the work done to bring a unit mass from ∞ to distance 'r' from sphere.
For mass 'm'
VG=−GMmr which is the total potential energy of the system
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