MHT CET · Physics · Mechanical Properties of Fluids
A wire of length \(10 \mathrm{~cm}\) is gently placed horizontally on the surface of water having surface tension of \(75 \times 10^{-3} \mathrm{~N} / \mathrm{m}\). What force is required to just pull up the wire from the water surface?
- A \(15 \times 10^{-2} \mathrm{~N}\)
- B \(7 \cdot 5 \times 10^{-2} \mathrm{~N}\)
- C \(1 \cdot 5 \times 10^{-2} \mathrm{~N}\)
- D \(75 \times 10^{-2} \mathrm{~N}\)
Answer & Solution
Correct Answer
(C) \(1 \cdot 5 \times 10^{-2} \mathrm{~N}\)
Step-by-step Solution
Detailed explanation
\(F=2(T L)=2 \times 75 \times 10^{-3} \times 10 \times 10^{-2}\)
\(=150 \times 10^{-4}=1.5 \times 10^{-2} \mathrm{~N}\)
\(=150 \times 10^{-4}=1.5 \times 10^{-2} \mathrm{~N}\)
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