1.

The work done in blowing a soap bubble of radius r of the solution of surface tension T will be [DPMT 1999; MP PMT 2003]

A. \[8\pi {{r}^{2}}T\]
B. \[2\pi {{r}^{2}}T\]
C. \[4\pi {{r}^{2}}T\]
D. \[\frac{4}{3}\pi {{r}^{2}}T\]
Answer» B. \[2\pi {{r}^{2}}T\]


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