$A$ uniform sphere has radius $R$ and mass $M$. The magnitude of the gravitational field at distances $r_1$ and $r_2$ from the centre of the sphere are $E_1$ and $E_2$ respectively. The ratio $E_1: E_2$ is ($r_1 > R$ and $r_2 < R$).
- A$\frac{r_2}{r_1^2}$
- B$\frac{r_1^2}{r_2}$
- C$\frac{R^3}{r_1^2 r_2}$
- D$\frac{r_1^2}{R^3}$
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