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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

12

B

15

C

3

D

9

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Knowledge Check

  • One end of a glass capillary tube with a radius r=0.05cm is immersed into water to a depth of h=2cm .Excess pressure required to blow an air bubble out of the lower end of the tube will be (S.T of water =70"dyne"//cm ).Take g=980cm//s^(2) .

    A
    `2840"dyne"//cm^(2)`
    B
    `5840"dyne"//cm^(2)`
    C
    `7840"dyne"//cm^(2)`
    D
    `4760"dyne"//cm^(2)`

  • A capillary tube is dipped in water with the lower and 10 cm below the surface. Water rises in the tube to a height of 5 cm. The pressure required to blow a bubble at the lower end of the tube will be (atmospheric pressure = 10^5 Nm^(-2) and g = 10 m//s^2 )

    A
    `10^5 Nm^(-2)`
    B
    `1.015 xx 10^5 Nm^(-2)`
    C
    `2xx10^5 Nm^(-2)`
    D
    `2.5 xx10^5 Nm^(-2)`

  • One end of a glass capillary tube with a radius r is immersed into water to a depth of h The surface tension of water is s and atmospheric pressure is p_0 . What pressure is required to blow an air bubble out of the lower end of the tube? Density of water is rho

    A
    `P_0-rhogh+(2s)/r`
    B
    `P_0+rhogh+(2s)/r`
    C
    `P_0+rhogh-(2s)/r`
    D
    `P_0-rhogh-(2s)/r`

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