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Questions  

The mass density of a planet of radius R varies with the distance r from its center as ρ(r)=ρ01-r2R2 . Then the gravitational field is maximum at :

a
r=13R
b
r=59R
c
r = R
d
r=34R

detailed solution

Correct option is B

For points  inside the planet, at distance r from the center r

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