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A glass rod of radius 1 mm is inserted s...

A glass rod of radius `1 mm` is inserted symmetrically into a glass capillary tube with inside radius `2 mm`. Then the whole arrangement is brought in contact with the surface of water. Surface tension of water is `7 xx 10^(-2) N//m`. To what height will the water rise in the capillary? (`theta = 0^@`)

A

`1.44cm`

B

`6cm`

C

`4.86`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
Here, surface tension force support the weight of liquid
`Sxx2pi[r+d/2]=(r^(2)-(d^(2))/4)hrhog`
`implies h=0.0144m=1.44cm`
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