पारे की \( 4.0 \mathrm{~mm} \) त्रिज्या की एक बूँद के सबसे ऊपर के भाग में \( 1 \mathrm{~mm}^{2} ...

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पारे की \( 4.0 \mathrm{~mm} \) त्रिज्या की एक बूँद के सबसे ऊपर के भाग में \( 1 \mathrm{~mm}^{2} \) की एक छोटी-सी सतह का विचार करें। इस सतह पर लगनेवाले (a) ऊपर की हवा के कारण बल, (b) इसके नीचे के पारे के कारण बल तथा (c) संपर्क में स्थित पारे की सतह के कारण बल निकालें। बायु का दाब \( =1.0 \times 10^{5} \mathrm{~Pa} \), पारे का पृष्ठ-तनाव \( =0.465 \mathrm{~N} / \mathrm{m} \). भार के प्रभाव को नगण्य मानें।
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