The mass density of a spherical body is given by $\rho $ (r) = ${k \over r}$ for r $ \le $ R and $\rho $ (r) = 0 for r > R, where r is the distance from the centre. The correct graph that describes qualitatively the acceleration, a, of a test particle as a function of r is :

Question

The mass density of a spherical body is given by
$\rho $ (r) = ${k \over r}$ for r $ \le $ R and $\rho $ (r) = 0 for r > R,

where r is the distance from the centre.

The correct graph that describes qualitatively the acceleration, a, of a test particle as a function of r is :

Solution

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