Gravitation attraction of inner portion problem

AI Thread Summary
The discussion centers on the gravitational attraction of a thin spherical layer within a uniformly dense sphere. It highlights a key point from Newton's Shell Theorem, which states that only the mass located within the layer contributes to the gravitational force acting on it, while the mass outside does not exert any attraction. The participant expresses confusion about why the outer portion of the sphere does not attract the layer. Clarification is sought on the implications of this theorem in the context of gravitational forces. Understanding this principle is essential for solving related problems in gravitation.
mooncrater
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Homework Statement


While solving a question on gravitation I had to consider a very thin spherical layer of a uniformly dense sphere. It's written in the solution that :
"Then the considered layer is attracted to the part of the sphere lying within it (outer part doesn't act on the layer)

Homework Equations

The Attempt at a Solution


I have problem in the bold part. Why won't the upper part not attract the layer? Why only the inner layer will do so?
 
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Look up Newton's Shell theorems.
 
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