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Q:

The value of the gravitational potential at the centre of a ring of radius “a” and mass “M” is _____

(a) zero

(b) -(G*M)/a

(c) -(G*M)/a^1/2

(d) infinite

1 Answer

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Right choice is (b) -(G*M)/a

Explanation: We know that the gravitational potential at a point “p” at a distance of “r” from the centre of the ring of radius “a” and mass M” is;

V = -(G*M)/(a^2+r^2)^1/2

At the centre of the ring; r = 0.

Therefore; V = -(G*M)/a.

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