Question

The magnitude of gravitational field at distance r1 and r2 from the centre of uniform sphere of radius r and mass m are f1 and f2 respectively then

Answer 1

your question is incomplete. A complete question is shown in figure.

solve :- we know, F = GM/r² , if r ≥ R

e.g,. Force is inversely proportional to r². when r ≥ R.

so, $\frac{F_1}{F_2}=\frac{r_2^2}{r_1^2}$ when , $r_1\geq R,r_2\geq R$

again, F = GMr/R³ , when r < R

e.g., Force is directly proportional to r. when r < R.

hence, $\frac{F_1}{F_2}=\frac{r_1}{r_2}$ when, $r_1<R,r_2<R$

Answer 2

Explanation:

therefore Correct option is (1) .good luck