A thin uniform annular disc (see figure) of mass M has outer radius 4R and inner...

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A thin uniform annular disc (see figure) of mass M has outer radius 4R and inner radius 3R. The work required to take a unit mass from point P on its axis to infinity is A) C) 2GM (42-5) 7R GM 4R 3R B) P B) 4R 4R 2GM (42-5) 7R 2GM (2-1) 5R A thin uniform annular disc (see figure) of mass M has outer radius 4R and inner radius 3R. The work required to take a unit mass from point P on its axis to infinity is A) C) 2GM (42-5) 7R GM 4R 3R B) P B) 4R 4R 2GM (42-5) 7R 2GM (2-1) 5R

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