JEE Mains · Physics · STD 11 - 9.2 surface tension
When a part of a straight capillary tube is placed vertically in a liquid, the liquid raises upto certain height h. If the inner radius of the capillary tube, density of the liquid and surface tension of the liquid decrease by 1% each, then the height of the liquid in the tube will change by __________ %.
- A -1
- B +3
- C -3
- D +1
Answer & Solution
Correct Answer
(D) +1
Step-by-step Solution
Detailed explanation
\( h=\frac{2T \cos \theta}{\rho gr} \) \( \frac{\Delta h}{h}\%=\frac{\Delta T}{T}\%-\frac{\Delta\rho}{\rho}\%-\frac{\Delta r}{r}\% \) \(\frac{\Delta h }{ h } \%=1+1+1\) \( \frac{\Delta h}{h}=+1\% \)
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