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Q.

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=2πr2T

c

W=2πrT

d

W=43πr3T

answer is B.

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Detailed Solution

The upward force due to surface tension is given by

 F=(2πr)Tcos⁡θ   Here θ=0, i.e., cos⁡θ=1 ∴ F=2πrT  or  W=2πrT

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