An open capillary tube is lowered in vessel with mercury. The difference between the levels of the mecury in the vessel and in the capillary tube `/_h=4.6 mm`. What is the radius of curvature of the mercury meniscus in the capillary tube? Surface tension of mercury is `0.46N//m`, density of mercury is `13.6gm//"cc"`.
A. `1/340m`
B. `1/680m`
C. `1/1020m`
D. information insufficient
