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Q.

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

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a

r−2

b

r4

c

r3

d

r−3

answer is A.

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Detailed Solution

F=Gm1m2r2=G.43πr3d.43πr3dr2=G.169π2r6d2r2⇒F∝r4
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