A cork ball is floating on the surface o...

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 evacuted. What wil happen to the ball ?

Sink a little

Rise a little

Remain ucchanged

Sink completely

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The correct Answer is:

(a) Hence upthrust due to air will be replaced by water vpours. As water vapours are lighter then air, hence upthrust decreases. So the ball sinks a little.

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