First slide
Gravitational field intensity
Question

A spherical shell is cut into two pieces along a chord as shown in the figure. P is a point on the plane of the chord. The gravitational field at P due to the upper part is I1 and that due to the lower part is I2. What is the relation between them? 

Easy
Solution

For a uniform spherical shell the field intensity at any inside point is zero. So I1+I2=0

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