A) \[0.0125\,\,N{{m}^{-1}}\]
B) \[0.1\,\,N{{m}^{-1}}\]
C) \[0.05\,\,N{{m}^{-1}}\]
D) \[0.025\,\,N{{m}^{-1}}\]
Correct Answer: D
Solution :
[d] At equilibrium, weight of the given block is balanced by force due to surface tension, i.e., \[2L.\,S=W\] or \[S=\frac{W}{2L}=\frac{1.5\times {{10}^{-2}}N}{2\times 0.3\,m}=0.025N{{m}^{-1}}\]
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