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When a long capillary tube of radius 0.0...

When a long capillary tube of radius 0.015 cm is dipped in a liquid, the liquid rises to a height of 15 cm within it. If the contact angle between the liquid and glass to close to `0^@`, the surface tension of the liquid, in milliNewton `m^(-1)`, is `[rho_("liquid") = 900 kgm^(-3), g = 10 ms^(-2)]` (give anwer is closet integer)

Text Solution

Verified by Experts

The correct Answer is:
101
`(2T)/(r) = h rhog`
`T=(rhrhog)/2 =(15 xx10^(-5)xx15 xx10^(-2)xx900xx10)/2`
`=101 ` milliNewton `m^(-1)`
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