Question

The gravitational field strength due to a solid sphere (mass $M$, radius $R$ ) varies with distance $r$ from centre as

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

${\vec{g}}^{\prime }=-\frac{g\vec{r}}{R}$ for $r\le R$ and
$g^{\prime }=\frac{g}{(1+r/R{)}^2}$ for $r\ge R$