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A point P lies on the axis of a ring of ...

A point P lies on the axis of a ring of mass M and radius a, at a distance a from its centre C. A small particle starts from P and reaches C under gravitational attraction only. Its speed at C will be

A

`sqrt((2GM)/(a))`

B

`sqrt((2GM)/(a)(1-(1)/(sqrt(2))))`

C

`sqrt((2GM)/(a)(sqrt(2)-1))`

D

zero

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The correct Answer is:
B
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