Water rises up to a height of $4 \mathrm{~cm}$ in a capillary tube. The lower end of the capillary tube is…
Water rises up to a height of $4 \mathrm{~cm}$ in a capillary tube. The lower end of the capillary tube is at a depth of $8 \mathrm{~cm}$ below the water level. The mouth pressure required to blow an air bubble at the lower end of the capillary will be ' $\mathrm{X}$ ' $\mathrm{cm}$ of water, where $\mathrm{X}$ is equal to
10
8
6
12
Solution
At the lower ends of the tube, the total pressure is due to height of water column in the container plus the height of water in the capillary.
$\therefore$ Total pressure is due to $8+4=12 \mathrm{~cm}$ of water.
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