MHT CET202012 Oct 2020Morning ShiftPhysicsMechanical Properties of FluidsActual
A wire of length 10 ~cm is gently placed horizontally on the surface of water having surface tension of 75 10³ ~N / m . What force is required to just pull up the wire from the water surface?
Options
- A15 10⁻² ~N
- B7 5 10⁻² ~N
- C1 5 10⁻² ~N
- D75 10⁻² ~N
Correct answer
C. 1 5 10⁻² ~N
Step-by-step solution
F=2(T L)=2 75 10⁻³ 10 10⁻²=150 10⁻⁴=1.5 10⁻² ~N