A drop of water of volume 'V' is pressed between the two glass plates so as to spread to an area A. If T is the surface tension, the normal force required to separate the glass plates is ______.

\frac{T A^{2}}{V}

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\frac{2 T A^{2}}{V}

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\frac{4 T A^{2}}{V}

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\frac{T A^{2}}{2 V}

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Solution

The correct option is B $\frac{2 T A^{2}}{V}$

$We know that$

$P = T (\frac{2}{d} - \frac{1}{α})$

$= \frac{2 T}{d}$

$v o l . = A d$

$f = P \cdot A = \frac{2 T}{d} \times A$

$= \frac{2 T A^{2}}{V}$

Answer:- (B)

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A drop of water of volume 'V' is pressed between the two glass plates so as to spread to an area A. If T is the surface tension, the normal force required to separate the glass plates is ______.

The correct option is B 2TA2V We know that P=T(2d−1α)=2Tdvol.=Adf=P⋅A=2Td×A =2TA2V Answer:- (B)

The correct option is B $\frac{2 T A^{2}}{V}$

$We know that$

$P = T (\frac{2}{d} - \frac{1}{α})$

$= \frac{2 T}{d}$

$v o l . = A d$

$f = P \cdot A = \frac{2 T}{d} \times A$

$= \frac{2 T A^{2}}{V}$

Answer:- (B)