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A long capillary tube of radius 0.2mm is...

A long capillary tube of radius 0.2mm is placed vertically inside a beaker of water
If the surface tension of water is `7.2 xx 10^(-7)` N/m and the angle of contact between glass and water is zero. Then determine the height of the water column in the tube

A

3 cm

B

9 cm

C

7 cm

D

5 cm

Text Solution

Verified by Experts

The correct Answer is:
C
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(i) Determine the height 'h' to which water rises when capillary tube of radius 0.2 mm is dipped vertically in a beaker containg water (Surface tension of water = 7.0xx10^(-2)Nm^(-1) and angle of contact 0^(@) ) (ii) Discuss what will happen if the capillary tube is now pushed down till its height above the surface of water is 4cm. Assume that the density of water is 1000kgm^(-3) and g is 10ms^(-2) .

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Knowledge Check

  • A capillary tube of radius 0.2mm is dipped vertically in a beaker containing water if surface tension of water is 7xx10^(-2)N//m the rise of water in the tube will be

    A
    `7mm`
    B
    `7cm`
    C
    `3.5mm`
    D
    3.5cm`

  • A capillary tube of radius 0.2mm is dipped vertically in a beaker containing water if surface tension of water is 7xx10^(-2)N//m the rise of water in the tube will be

    A
    `7mm`
    B
    `7cm`
    C
    `3.5mm`
    D
    `3.5cm`

  • A long capillary tube of radius 0.2mm is placed vertically inside a beaker of water If the tube is now pushed into water so that only 5.0 cm of its length is above the surface. Then determine the angle of contact between the liquid and glass surface

    A
    `cos^(-1) ""((4)/(5))`
    B
    `cos^(-1) ""((5)/(7))`
    C
    `cos^(-1)""((3)/(5))`
    D
    `cos^(-1)""(5/4)`

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