Question:medium
If the work done in increasing the area of a thin soap film from $A$ to $3A$ is $W$, then the surface tension of the soap solution is
If the work done in increasing the area of a thin soap film from $A$ to $3A$ is $W$, then the surface tension of the soap solution is
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Logic Tip: The phrase "soap film" or "soap bubble" is a trap specifically designed to test if you remember to multiply the area by 2. If it were a water drop or a liquid surface in a cup, there would only be 1 free surface, and the answer would be $\frac{W}{2A}$.
Updated On: Apr 27, 2026
- $\frac{W}{A}$
- $\frac{W}{4A}$
- $WA$
- $2WA$
- $\frac{W}{3A}$
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The Correct Option is B
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