A ring of mass m1 and radius R is fixed in space at some location. An external agent brings a point mass m2 from infinity to centre of the ring . Work done by the external agent will be
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a
-Gm1m2R
b
Gm1m2R
c
Gm12 + m22R
d
Gm1m2R(m12 + m22)
answer is A.
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Detailed Solution
Work done, W = ∆U = Uf - Ui = Uf (∵ Ui = 0)⇒ W = -(Gm1m2/R)