Q.

The magnitudes of the gravitational force at distances  r1 and  r2 from the centre of a uniform sphere of radius R and mass M are F1  and  F2 respectively. Then

Moderate

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a

F1F2=r1r2 if r1

b

F1F2=r12r22 if r1>R and r2>R

c

F1F2=r1r2 if r1>R and r2>R

d

F1F2=r22r12 if r1

answer is 1, 4.

(Detailed Solution Below)

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Detailed Solution

g=43πρGr ∴g∝r  if rR If r1R and r2>R then F1F2=g1g2=r2r12
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