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Q.

Two solid metal spheres of same material and each of radius ‘r’ are in contact with each other. The gravitational force of attraction between the sphere is proportional to

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a

F∝r3

b

F∝r

c

F∝r2

d

F∝r4

answer is D.

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Detailed Solution

F=Gm1m2(2r)2=G(43πr3d)(43πr3d)4r2=Kr4

i.e  F∝r4

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