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The lower end of a capillary tube of rad...

The lower end of a capillary tube of radius r is placed vertically in water of density `rho` , surface tension S. The rice of water in the capillary tube is upto height h, then heat evolved is

A

`+(pir^(2)h^(2)dg)/(2J)`

B

`+(pir^(2)h^(2)dg)/(J)`

C

`-(pir^(2)h^(2)dg)/(2J)`

D

`-(pir^(2)h^(2)dg)/(J)`

Text Solution

Verified by Experts

The correct Answer is:
A
Work done `=` heat evolved `W=JQ,Q=(mgh)/(2J)`
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