An annular disc of radii $r_{1} = 10 c m$ and $r_{2} = 5 c m$ is placed on a water surface. Find the surface tension force on the
disc if we want to pull it form the water surface. Take the coefficient of surface tension $= g = 10 m s^{- 2}$ .

6782.4

dyne

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67.82

dyne

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678.24

dyne

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none of these

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Solution

The correct option is A $6782.4$ dyne
$F = 2 π r_{1} + 2 π r_{2} T$
$= 2 π (r_{1} + r_{2}) T$
$= 2 \times 3.14 (10 + 5) (72)$
$= 6782.4$ dyne

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Similar questions

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An annular disc of radii r1=10 cm and r2=5 cm is placed on a water surface. Find the surface tension force on the disc if we want to pull it form the water surface. Take the coefficient of surface tension =g=10 ms−2.

The correct option is A 6782.4 dyneF=2πr1+2πr2T =2π(r1+r2)T =2×3.14(10+5)(72) =6782.4 dyne

An annular disc of radii $r_{1} = 10 c m$ and $r_{2} = 5 c m$ is placed on a water surface. Find the surface tension force on the
disc if we want to pull it form the water surface. Take the coefficient of surface tension $= g = 10 m s^{- 2}$ .

The correct option is A $6782.4$ dyne
$F = 2 π r_{1} + 2 π r_{2} T$
$= 2 π (r_{1} + r_{2}) T$
$= 2 \times 3.14 (10 + 5) (72)$
$= 6782.4$ dyne