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A thin uniform disc (see figure) of mas...

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

A

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

B

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

C

`(GM)/(4R)`

D

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

Text Solution

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The correct Answer is:
A
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