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A circular loop of thin wire of radius 7...

A circular loop of thin wire of radius 7 cm is lifted from the surface of a liquid . An additional force of ` 44 xx 10^(-2)` N is required to detach the loop from the surface of the liquid . The surface tension of the liquid in N/m is

A

`0.5`

B

1

C

`2.86`

D

`6.826`

Text Solution

Verified by Experts

The correct Answer is:
A
`F = 2 l T`
l is the circumference of the loop = `2pir`
` :. 2(2pir) T = F`
` T = F/(4pir) = (44xx10^(-2)N)/(4xx7xx10^(-2)xxpim)`
` = 0.5 ` N/m
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NIKITA PUBLICATION-SURFACE TENSION-Multiple Choice Questions (Surface tension )
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