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JEE Main20203 Sep 2020Morning ShiftPhysicsMechanical Properties of FluidsActual

When a long glass capillary tube of radius 0 . 015 cm is dipped in a liquid, the liquid rises to a height of 15   cm within it. If the contact angle between the liquid and glass to close to 0 ° , the surface tension of the liquid, in milliNewton m - 1 , is ρ (liqued)  = 900   kg   m - 3 , g = 10   m   s - 2 (Given answer in closed integer)

Correct answer

101

Step-by-step solution

Using the concept of rise due to surface tension, 2 T r = hρg T = rhρg 2 = 15 × 10 - 5 × 15 × 10 - 2 × 900 × 10 2 = 101   milliNewton   m - 1

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