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A thin uniform annular disc (see figure)...

A thin uniform annular disc (see figure) of mass M has an outer radius 4R and an inner radius 3R. The work required to take a unit mass from point P on its axis to infinity is :

A

`(2GM)/(7R)(4sqrt2-5)`

B

`-(2GM)/(7R)(4sqrt2-5)`

C

`(GM)/(4R)`

D

`(2GM)/(5R)(sqrt2-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
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