A) \[3.6\times {{10}^{-3}}N\]
B) \[3.4\times {{10}^{-10}}N\]
C) \[3.0\times {{10}^{-5}}N\]
D) \[3.8\times {{10}^{-11}}N\]
Correct Answer: A
Solution :
The force of surface tension \[F=T-2l\] \[=7.2\times {{10}^{-2}}\times 2\times 2.5\times {{10}^{-2}}\] \[=3.6\times {{10}^{-3}}N\]
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