1. Tardigrade
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  4. A point P is lying at a distance r(< a) from the centre of shell of radius a. If g and V be the gravitational field and potential at the point P then :

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Q. A point $P$ is lying at a distance $r(< a)$ from the centre of shell of radius $a$. If $g$ and $V$ be the gravitational field and potential at the point $P$ then :

Gravitation

Solution:

The field inside the shell is zero and so potential inside the shell is constant and equal to the value that exists at the surface i.e. $-\frac{G M}{a}$.