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

Question

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 4 2 5 C 2GM 7R GM 4R 3R B P D 4R 4R 2GM 7R 2GM 5R 4 2 5 2 1

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