Q 11-07-098JEE MainJEE Main 2023 (11 Apr, Shift 1)Easy
The radii of two planets $A$ and $B$ are $R$ and $4R$ and their densities are $\rho$ and $\dfrac\rho3$ respectively. The ratio of acceleration due to gravity at their surfaces $g_A:g_B$ will be
Answer: (D) $3:4$
$g\propto\rho R$: $\dfrac{g_A}{g_B}=\dfrac{\rho R}{(\rho/3)(4R)}=\dfrac34$.
Solution by Sreeraj P, M.Sc Physics