A) \[hr=constant\]
B) \[\frac{h}{{{r}^{2}}}=constant\]
C) \[h{{r}^{2}}=constant\]
D) \[\frac{h}{r}=constant\]
Correct Answer: A
Solution :
The height h to which the liquid rises in a capillary tube is given by \[h=\frac{2T\cos \,\theta }{r\rho g}\] Since T,\[\cos \,\theta \], \[\rho \] and g are constants, hence \[hr\text{ }=\text{ }constant.\]
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