Assuming the earth to be a sphere of uniform density the acceleration due to gravity:

Options

A. at a point outside the earth is inversely proportional to the square of its distance from the centre
B. at a point outside the earth is inversely proportional to its distance from the centre
C. at a point inside is zero
D. at a point inside is proportional to its distance from the centre

Answer

A, D

Explanation

`g=(GM)/r^2` for `r ge R`
`g=(GM)/R^3`r for r < R