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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 start from P and reaches C under gravitational attraction its speed C will be

A

`sqrt((2GM)/a)`

B

`sqrt(((2Gm)/a)(1-(1/sqrt2)))`

C

`sqrt(((2Gm)/a)(sqrt2-1))`

D

Zero

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The correct Answer is:
B
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