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The lower end of a capillary tube is at ...

The lower end of a capillary tube is at a depth of `12 cm` and water rises `3 cm` in it. The mouth pressure required to blow an air bubble at the lower end will be `x cm` of water column, where `x` is

A

`3`

B

`9`

C

`12`

D

`15`

Text Solution

Verified by Experts

The correct Answer is:
D
The lower end of capillary tube is at a depth of `12+3=15cm` from the free surface of water in capillary tube.
So, the pressure required `=15cm` of water column.
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