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MHT CET202015 Oct 2020Evening ShiftPhysicsMechanical Properties of FluidsActual

Due to surface tension, the excess pressure inside a smaller drop is 9 units. If 27 smaller drops combine, then the excess pressure inside the bigger drop is

Options

  1. A2 units
  2. B1 unit
  3. C3 units
  4. D4 units

Correct answer

C. 3 units

Step-by-step solution

Given P_ in -P_ out = 4 T r =9 units If 27 such drop coalesee 27 ( 4 3 r³ )= 4 3 r_ b ³ 3 r=r_ b Excess pressure 4 ~T r _ b = 4 ~T 3 r = 9 3 =3 unit

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