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Q.

Gravitational force between a point mass m and M separated by a distance is F. Now, if a point mass 2m is placed next to m in contact with it, the force on M due to m and the total force on M are:

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a

2F, F

b

F, 2F 

c

F, 3F 

d

F, F

answer is C.

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Detailed Solution

F=Gm1m2r2 or Fm1m2

Force on mass M due to mass m alone is F and due to mass 2m force is 2F. Therefore, the total force is 3F.

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