In a capillary tube of radius R, a straight thin metal wire of radius 
is inserted symmetrically and one end of the combination is dipped vertically in water such that the lower end of the combination is at same level. The rise of water in the capillary tube is 
surface tension of water, 
density of water, 
gravitational acceleration]
Text Solution
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Total vertical upward force acting on the water column inside the capillary
for water 
… .(i)
Total downward force 
weight of water column inside the capillary
… ..(ii)
Equating eqns. (i) and (ii), we get
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