MHT CET202120 Sep 2021Morning ShiftPhysicsMechanical Properties of FluidsActual
What should be the radius of water drop so that excess pressure inside it is 72 Nm ⁻² ? (The surface tension of water 7.2 10⁻² Nm ⁻¹ )
Options
- A1 ~mm
- B2 ~mm
- C8 ~mm
- D4 ~mm
Correct answer
B. 2 ~mm
Step-by-step solution
Excess pressure in a water drop = 2 T R aligned & T =7.2 10⁻² Nm ⁻² & 72= 2 7.2 10⁻² R & R = 2 7.2 10⁻² 72 =2 10⁻³ ~m =2 ~mm aligned