The magnitude of the gravitational field at distance r₁ and r₂ from the centre of a uniform sphere of radius R and mass M are F₁ and F₂ respectively then:

(F₁/F₂) = (r₁/r₂) if r₁ < R and r₂ < R

$F \propto r$          (r < R)

$F \propto \frac{1}{r^2}$        ( r > R)

$\frac{F_1}{F_2}=\frac{r_1}{r_2}$      if  r < R

&  $\frac{F_1}{F_2}=\left(\frac{r_2}{r_1}\right)^2$      if  r > R