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Standard XII

Chemistry

Surface Tension

A square plat...

Question

A square plate of glass of side $7 c m$ and thickness $2 m m$ . is placed with its square face flat on a liquid surface. If the surface tension of the liquid is $20 d y n / c m$ , the force of surface tension on the glass plate is

298 d y n e s

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140 d y n e s

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560 d y n e s

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576 d y n e s

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Solution

The correct option is D $576 d y n e s$
Surface tension will act along perimeter

and thickness

Total length where surface tension will act = L

$\begin{matrix} L = 4 \times (7) + 4 (0.2) L = & 28.8 c m \end{matrix}$

Force $(F) = σ L =$

where $T = 20$ dynes/cm

$∴ F = 20 (28.8) = 576$ dynes

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A square plate of glass of side 7 cm and thickness 2 mm. is placed with its square face flat on a liquid surface. If the surface tension of the liquid is 20 dyn/cm, the force of surface tension on the glass plate is

The correct option is D 576 dynesSurface tension will act along perimeter and thickness Total length where surface tension will act = L L=4×(7)+4(0.2)L=28.8 cm Force (F)=σL= where T=20 dynes/cm ∴F=20(28.8)=576 dynes

A square plate of glass of side $7 c m$ and thickness $2 m m$ . is placed with its square face flat on a liquid surface. If the surface tension of the liquid is $20 d y n / c m$ , the force of surface tension on the glass plate is

The correct option is D $576 d y n e s$
Surface tension will act along perimeter

and thickness

Total length where surface tension will act = L

$\begin{matrix} L = 4 \times (7) + 4 (0.2) L = & 28.8 c m \end{matrix}$

Force $(F) = σ L =$

where $T = 20$ dynes/cm

$∴ F = 20 (28.8) = 576$ dynes