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Gravitation question

2010 · Shift 1 · Q71
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Gravitation question

2010 · Shift 1 · Q71

JEE AdvancedPhysicsGravitationMCQ+3 / −1
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 IIT-JEE 2010 Paper 1 Offline Physics - Gravitation Question 10 English
  1. A
    2GM7R(42−5){{2GM} \over {7R}}(4\sqrt 2 - 5)7R2GM​(42​−5)
  2. B
    −2GM7R(42−5)- {{2GM} \over {7R}}(4\sqrt 2 - 5)−7R2GM​(42​−5)
  3. C
    GM4R{{GM} \over {4R}}4RGM​
  4. D
    2GM5R(2−1){{2GM} \over {5R}}(\sqrt 2 - 1)5R2GM​(2​−1)
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