A particle of mass $M$ is situated at the centre of a spherical shell of same mass and radius $a$. The gravitational potential at a point situated at $\frac {a}{2}$ distance from the centre, will be
A particle of mass $M$ is situated at the centre of a spherical shell of same mass and radius $a$. The gravitational potential at a point situated at $\frac {a}{2}$ distance from the centre, will be
- A
$\frac {-\,GM}{a}$
- B
$\frac {-\,2GM}{a}$
- C
$\frac {-\,3GM}{a}$
- D
$\frac {-\,4GM}{a}$
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