Gravitational mass is proportional to gravitational

What is the intensity of the gravitational field at the center of a spherical shell?

What is the relationship between gravitational field intensity $(I)$ and gravitational potential $(V)$ at a point?

Define the intensity of the gravitational field and write its equation,unit,and dimensional formula.

Which one of the following graphs correctly represents the variation of the gravitational field $(I)$ with the distance $(r)$ from the centre of a spherical shell of mass $M$ and radius $a$?

Two masses $90 \ kg$ and $160 \ kg$ are separated by a distance of $5 \ m$. The magnitude of the intensity of the gravitational field at a point which is at a distance $3 \ m$ from the $90 \ kg$ mass and $4 \ m$ from the $160 \ kg$ mass is (Universal gravitational constant,$G=6.67 \times 10^{-11} \ N \ m^2 \ kg^{-2}$)