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A solid sphere of mass M and radius R is...

A solid sphere of mass `M` and radius `R` is surrounded by a concentric shell of equal mass `M` and radius `3R`. The gravitational field at a point `P_(1)` at a distance `r_(1)=2R` from the centre is `I_(1)` and a point `P_(2)`at distance `r_(2)=4R` from the centre is `I_(2)` The ratio `(I_(2))/(I_(1))`

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