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 : 

\(I_1 = I_2\)

Intensity at P due to upper part I₁ and Intensity at P due to lower part = l₂ .

Net Intensity at p due to spherical shell :

\(I_1 + I_2 = 0\) 

\(\Rightarrow |I_1| = |I_2|\)