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 t

Question

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 t

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`

Monjur Alahi

6 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - 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

6 views Answered 2023-02-05 15:29