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Question

One end of a glass capillary tube with a radius r=0.05 cm is immersed into water to a depth of h=2cm. What pressure is required to blow an air bubble out of the lower end of the tube:
T=7×102N/m and ρ=103 kg/ m3)

A
480 N/ m2 2
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B
680 N/ m2 3
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C
2003 N/ m2 4
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D
820 N/ m2
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Solution

The correct option is C 2003 N/ m2 4
Pressure (P)=pgh+2Tr
=103×10×2+2×7×1020.05
=20000+3
=20003N/m2
Hence, the answer is 20003N/m2.


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