Q 11-07-121JEE MainJEE Main 2022 (26 Jun, Shift 1)Easy
The variation of acceleration due to gravity $(g)$ with distance $(r)$ from the center of the earth is correctly represented by (Given $R$ = radius of earth)
Answer: (A) see figure
Inside the earth (uniform density) $g = \dfrac{GM}{R^3}r\propto r$: a straight line from the origin. Outside, $g = \dfrac{GM}{r^2}\propto\dfrac1{r^2}$. The maximum is at the surface $r = R$, which matches graph (1).
Solution by Sreeraj P, M.Sc Physics