A wire of length 10 text{ cm} is gently place | vedclass

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Question

(C) The force required to pull a wire of length $L$ from the surface of a liquid with surface tension $T$ is given by the formula $F = 2TL$.The factor

Vedclass · Accepted Answer

$1.5 	imes 10^{-2} 	ext{ N}$

Vedclass · Answer

(C) The force required to pull a wire of length $L$ from the surface of a liquid with surface tension $T$ is given by the formula $F = 2TL$.The factor of $2$ is used because the water surface is in contact with both sides of the wire.Given: $L = 10 	ext{ cm} = 0.1 	ext{ m}$ and $T = 75 	imes 10^{-3} 	ext{ N/m}$.Substituting the values: $F = 2 	imes (75 	imes 10^{-3} 	ext{ N/m}) 	imes (0.1 	ext{ m})$.$F = 2 	imes 75 	imes 10^{-4} 	ext{ N} = 150 	imes 10^{-4} 	ext{ N} = 1.5 	imes 10^{-2} 	ext{ N}$.

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

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