A wire of length 10 cm is gently placed horizontally on the surface of water having surface tension of 75 × 1 0 3 N / m . What force is required to just pull up the wire from the water surface?

F = 2 ( T L ) = 2 × 75 × 1 0 − 3 × 10 × 1 0 − 2 = 150 × 1 0 − 4 = 1.5 × 1 0 − 2 N

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Physics - Fluid Question with Solution | TestHub

PhysicsFluidSurface TensionEasy2 minPYQ_2020

PhysicsEasysingle choice

A wire of length $10 cm$ is gently placed horizontally on the surface of water having surface tension of $75 \times 1 0^{3} N / m$ . What force is required to just pull up the wire from the water surface?

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Answer:

Solution:

$F = 2 (T L) = 2 \times 75 \times 1 0^{- 3} \times 10 \times 1 0^{- 2}$ $= 150 \times 1 0^{- 4} = 1.5 \times 1 0^{- 2} N$

Stream:MHT_CETSubject:PhysicsTopic:FluidSubtopic:Surface Tension

⏱ 2mℹ️ Source: PYQ_2020

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