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QJEEM19Phe9b4: JEE Main 2019 Physics - Class 11 JEEM19Phe9b4 Solution: The ratio of surface tensions of mercury and water is given to…

The ratio of surface tensions of mercury and water is given to be 7.5 while the ratio of thier densities is 13.6. Their contact angles, with glass, are close to 135° and 0°, respectively. It is observed that mercury gets depressed by an amount h in a capillary tube of radius r1, while water rises by the same amount h in a capillary tube of radius r2. The ratio, (r1/r2), is then close to :

Multiple Choice Options

  • A `2/3
  • B `2/3
  • C `3/5
  • D `4/5

Step-by-Step Verified Solution

h=2S1cos⁡θr1ρ1g

h=2s2cos⁡θ2r2ρ2g

⇒r1r2=25

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