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A U-tube with limbs A and B of equal len...

A U-tube with limbs A and B of equal length is closed at the top of B. Mercury is now poured gradually into the limb A, so that air gets trapped in B, it is found that when the mercury level reaches the top of A, the level in B reaches half its height. The external pressure is 1 atm. What is the length of the limb, A ? Neglect the volume of the connecting tube.

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4.56 m
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