(c) For the first limb of the tube, height ascent by liquid h1=
2Tcosθ
rrρg
where, T= surface tension, θ= angle of contact, r1= radius of tube, ρ= density of liquid and g= gravitational acceleration. For the second limb of the tube, height ascent by liquid, h2=
2Tcosθ
r2ρg
∴h1−h2=
2Tcosθ
ρg
[
1
r1
−
1
r2
]
Given, T=0.03Nm−1, r1=2mm=2×10−3m, r2=4mm=4×10−3m, θ=0∘,ρ=150kgm−3 and g=10ms−2 h1−h2=