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Q.

Two homogenous hemispheres are first arranged as shown in the figure with their circular bases in contact and the mutual gravitational force of attraction between them is “F”.  Now their orientation is changed so that their curved surfaces touch each other and their bases are parallel to each other as shown in the second figure.  Now the mutual gravitational force of attraction is
 

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a

zero

b

> F

c

< F 

d

F

answer is C.

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Detailed Solution

Separation between the parts increases, so force decreases. 

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