Consider a spherical planet of radius R . Its density varies with the distance of its centre t as `rho=A-Br`, where A and B are positive constants. Now answer the following questions.
For B=0 , pressure due to gravitation force at a distance `r( ltR)` from the centre of the planet is

Options

A. `(2)/(3)piGA^(2)(R^(2)-r^(2))`
B. `(1)/(3)piGA^(2)(R^(2)-r^(2))`
C. `(3)/(2)piGA^(2)(R^(2)-r^(2))`
D. `(4)/(3)piGA^(2)(R^(2)-r^(2))`

Answer

A