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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  on its axix to infinity is....

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  1. fraction numerator 2 G M over denominator 7 R end fraction left parenthesis 4 square root of 2 minus 5 right parenthesis
  2. negative fraction numerator 2 G M over denominator 7 R end fraction left parenthesis 4 square root of 2 minus 5 right parenthesis
  3. fraction numerator G M over denominator 4 R end fraction
  4. fraction numerator 2 G M over denominator S R end fraction left parenthesis square root of 2 minus 1 right parenthesis

    Answer:The correct answer is: fraction numerator 2 G M over denominator 7 R end fraction left parenthesis 4 square root of 2 minus 5 right parenthesis

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