A capillary tube of radius r is immersed in a liquid. The liquid rises to a height h. The corresponding mass is m. What mass of water shall rise in the capillary if the radiusof the tube is doubled?
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a
m
b
2m
c
3m
d
4m
answer is B.
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Detailed Solution
Mass of liquid which rises in the capillary,m = (πr2)hρ = πr2×2σcosθrρg×ρ or m∝rClearly, if the radius is doubled, the mass is doubled.