A cork ball is floating on the surface of water in a beaker. The beaker is covered with a bell jar and the air is evacuated. What will happen to the ball?
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a
Sink a little
b
Rise a little
c
Remain unchanged
d
Sink completely
answer is A.
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Detailed Solution
Here, upthurst due to air will be replaced by water vapours. As water vapours are lighter than air, hence upthurst decreases. So the ball sinks a little.