AIPMT PRELIMS 2010 Physics Gravitational Potential MCQ Question
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 a/2 distance from the centre, will be
-4GM/a
-3GM/a
-2GM/a
-GM/a
Correct Answer
Detailed Explanation
The gravitational potential inside a spherical shell is constant and equal to the potential at the surface. The potential due to the central mass at a/2 is -2GM/a, and the shell contributes -GM/a, giving a total of -3GM/a.
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