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:
Answer & explanation
Correct answer: option 1
$F \propto r$ (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