A) \[{{10}^{2}}dyne\]
B) \[{{10}^{4}}dyne\]
C) \[{{10}^{5}}dyne\]
D) \[{{10}^{6}}dyne\]
Correct Answer: C
Solution :
The shape of. water layer between the two plates is shown in the figure. Thickness \[d\] of the film\[=0.12\,\,mm\] \[=0.012\,\,cm\] Radius \[R\] of the cylindrical face\[=\frac{d}{2}\] Pressure difference across the surface \[=\frac{T}{R}=\frac{2T}{d}\] Area of each plate wetted by water\[=A\] Force \[F\] required to separate the two plates is given by \[F=\]pressure difference\[\times \]area \[=\frac{2T}{d}A\] Putting the given values, we get \[F=\frac{2\times 75\times 8}{0.012}={{10}^{5}}dynes\]You need to login to perform this action.
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