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When one end of the capillary is dippe...

When one end of the capillary is dipped in water, the height of water column is `'h'`. The upward force of 105 dyne due to surface tension is balanced by the force due to the weight of water column . The inner circumference of the capillary is
(Surface tension of water `= 7 xx 10^(-2) N//m`)

A

1.5 cm

B

2 cm

C

2.5 cm

D

3 cm

Text Solution

Verified by Experts

The correct Answer is:
A
`F=105"dyne "=105 xx 10^(-5) N`,
`T=7 xx 10^(-2)N//m`
`2pir T=F`
`2pir=F/T =(105xx10^(-5))/(7xx 10^(-2))`
`=15 xx 10^(-3) m`
`=1.5 xx 10^(-2)m`
=1.5 cm
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