1.

Water rises to a height of 6.6cm in a capillary tube of radius 0.2mm. The surface tension of water is (g=10ms^(-2)).

Answer»

`6.5xx10^(-3)N//m`
`6.5xx10^(-2)N//m`
`6.5xx10^(-4)N//m`
`6.5xx10^(-1)N//m`

ANSWER :B


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