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MHT CET20192 May 2019Morning ShiftPhysicsMechanical Properties of FluidsActual

In air, a charged soap bubble of radius ‘ R ’ breaks into 27 small soap bubbles of equal radius ‘ r ’. Then, the ratio of mechanical force acting per unit area of big soap bubble to that of a small soap bubble is

Options

  1. A1 81
  2. B3 1
  3. C1 3
  4. D9 1

Correct answer

D. 9 1

Step-by-step solution

∵ R = n 1 3 . r R = 27 1 3 . r R = 3 r ∴ F A ∝ 1 r 2 F A B i g F A S m a l l = 1 3 r 2 1 r 2 = 1 9

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