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A J-tube, shown in figure, contains a vo...

A J-tube, shown in figure, contains a volume V of dry air trapped in arm A of the tube. The atmoshpere pressure is H cm of mercury. When more mercury is poured in arm B, the volume of the enclosed air and its pressure changes. What should be the difference in mercury levels in the two arms so as to reduce the volume of air 1/2.

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