MHT CET · Physics · Mechanical Properties of Fluids
A disc of paper of radius ' \(R\) ' has a hole of radius ' \(r\) '. It is floating on a liquid of surface tension ' T '. The force of surface tension on the disc is
- A \(2 \pi \mathrm{~T}(\mathrm{R}-\mathrm{r})\)
- B \(2 \pi \mathrm{~T}(\mathrm{R}+\mathrm{r})\)
- C \(3 \pi \mathrm{~T} \cdot \mathrm{R}\)
- D \(4 \pi \mathrm{~T}(\mathrm{R}+\mathrm{r})\)
Answer & Solution
Correct Answer
(B) \(2 \pi \mathrm{~T}(\mathrm{R}+\mathrm{r})\)
Step-by-step Solution
Detailed explanation
\( F = T \cdot (2 \pi R + 2 \pi r) \) \( F = 2 \pi T (R + r) \)
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