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6. A liquid is coming out from a vertical tube. The relation between the weight of the drop W, surface tension of the liquid T and radius of the tube r is given by, if the angle of contact is zero

(a)  w= πr2T

(b) w= 2πrT

(c)w= 2πr2T

(d) w= (3/4)πr3 T

Ans. b

(4)

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