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The fig. below shows a thin liquid supporting a small weight 4.5 × 10–2 N. What is the weight supported by a film of same liquid at the same temperature in fig. (b) & (c). Explain your answer. |
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Answer» The weight supported by (b) and (c) are same as that in (a) and is equal to 4.5 × 10–2 N. The weight supported = 2 σ l, where σ is surface tension and l is the length which is same in all the three cases, hence weight supported is same. |
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