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In a capillary rise experiment, the wate...

In a capillary rise experiment, the water level rises to a height of 5 cm. If the same capillary tube is placed in water such that only 3 cm of the tube projects outside the water level, then

A

Water will begin to overflow through the capillary

B

Angle of contact decreases

C

Angle of contact increases

D

The meniscus completely vanishes

Text Solution

Verified by Experts

The correct Answer is:
C
hr = constant
`implies h_1r_1 = h_2r_2`
`implies 5r_1=3r_2 implies r_2 =5/3 r_1`
When radius increases
Angle of contact increases. `" " [:. cos theta =(rghrho)/(2sigma)]`
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