A) 30 dyne/cm
B) 20 dyne/cm
C) 40 dyne/cm
D) 80 dyne/cm
Correct Answer: A
Solution :
Excess pressure \[p=\frac{4T}{r}\] \[T=\frac{pr}{4}\] \[=\frac{30\times 4}{4}\] \[=30\,dyne/cm\]You need to login to perform this action.
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