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Capillary Action

A glass capil...

Question

A glass capillary sealed at the upper end is of length $0.1 m$ and internal diameter $2 \times 10^{- 5} m .$ the tube is immersed vertically into a liquid of specific gravity $0.75$ & surface tension $5 \times 10^{- 2} N m^{- 1} .$ Atmospheric pressure is $1 \times 10^{5} N m^{- 2} .$ (Assume angle of contact is zero)

The length to which the capillary has to be immersed inside the liquid so that the liquid level inside and outside the capillary becomes same is

1 c m

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If the seal is broken liquid level inside the capillary will rise.

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If the seal is broken liquid level inside the capillary remains unchanged.

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If the capillary is lifted outward (after seal is broken and liquid level inside it has stabilized), no liquid will spill out of capillary and lower surface is concave from below.

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Solution

The correct options are
A The length to which the capillary has to be immersed inside the liquid so that the liquid level inside and outside the capillary becomes same is $1 c m$
B If the seal is broken liquid level inside the capillary will rise.

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A glass capillary sealed at the upper end is of length 0.1m and internal diameter 2×10−5 m. the tube is immersed vertically into a liquid of specific gravity 0.75 & surface tension 5×10−2 Nm−1. Atmospheric pressure is 1×105 Nm−2. (Assume angle of contact is zero)

The correct options are A The length to which the capillary has to be immersed inside the liquid so that the liquid level inside and outside the capillary becomes same is 1cm B If the seal is broken liquid level inside the capillary will rise.

The correct options are
A The length to which the capillary has to be immersed inside the liquid so that the liquid level inside and outside the capillary becomes same is $1 c m$
B If the seal is broken liquid level inside the capillary will rise.