Liquid drops are falling slowly one by one from a vertical glass tube. Establish a relation between the weight of a drop w, the surface tension land the radius r of the tube (assume the angle of contact to be zero)
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a
W=πr2T
b
W=2πrT
c
w=2πr2T
d
W=43πr3T
answer is B.
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Detailed Solution
The upward force due to surface tension is given by F=(2πr)Tcosθ Here θ=0, i.e., cosθ=1 ∴ F=2πrT or W=2πrT
Liquid drops are falling slowly one by one from a vertical glass tube. Establish a relation between the weight of a drop w, the surface tension land the radius r of the tube (assume the angle of contact to be zero)