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 A sphere of radius R and made of material of relative density s has a concentric cavity of radius r. It just floats when placed in a tank full of water. The value of the ratio R/r will be
  • a)
     
  • b)
     
  • c)
  • d)
     
Correct answer is option 'A'. Can you explain this answer?
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A sphere of radius R and made of material of relative density s has a ...
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A sphere of radius R and made of material of relative density s has a ...
If the sphere is "just" floating means the sphere is exactly immersed in water (or) the buoyant force acting on it is exactly equal to it's weight. The cavity reduces the wight of the actual sphere but has no role in the buoyant force. 

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A sphere of radius R and made of material of relative density s has a ...
If the sphere is "just" floating means the sphere is exactly immersed in water (or) the buoyant force acting on it is exactly equal to its weight. The cavity reduces the weight of the actual sphere but has no role in the buoyant force.
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