A uniform solid sphere of mass M and radius a s surrounded symmetrically by a uniform thin spherical shell of a equal mass and radius 2a. find gravitational field at a distane 5/2 a from the center.

Since, the point P is outside of both the spheres, the mass of the spheres can be considered to be concentrated at their common center.

So, the gravitational field at P will be due to a mass 2M at a distance 5/2 a.

Directed towards the center.

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