Assuming the earth to be a sphere of uniform density, the acceleration due to gravity inside the earth at a distance of $r$ from the centre is proportional to (1) $r$ (2) $r^{-1}$ (3) $r^{2}$ (4) $r^{-2}$
Assuming the earth to be a sphere of uniform density, the acceleration due to gravity inside the earth at a distance of $r$ from the centre is proportional to\\
(1) $r$\\
(2) $r^{-1}$\\
(3) $r^{2}$\\
(4) $r^{-2}$