While measuring surface temsoion of water using capillary rise method, heihgt of the lowr meniscus from free surface of water is 3 cm while inner radius of capillary tube is found to be `0.5` cm. Then compute tension of water using this data. (Take contact angle between glass and water and a 0 and `g=9.81 m//s^(2)`A. `0.72 N//m`B. `0.77 N//m`C. `1.67 N//m`D. None of the above

While measuring surface temsoion of water using capillary rise method,

1.	While measuring surface temsoion of water using capillary rise method, heihgt of the lowr meniscus from free surface of water is 3 cm while inner radius of capillary tube is found to be `0.5` cm. Then compute tension of water using this data. (Take contact angle between glass and water and a 0 and `g=9.81 m//s^(2)`A. `0.72 N//m`B. `0.77 N//m`C. `1.67 N//m`D. None of the above
Answer» (b) As , T `(r(h+(r)/(3))rhog)/(2 costheta)` `=(0.5xx10^(-2)[3+(0.5)/(3)]xx10^(-2)xx10^(3)xx9.81)/(2)=0.77N//m`

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