A capillary tube of radius r can support a liquid of weight 6.28 xx 10^(-4) N. If the surface tension of the liquid is 5 xx 10^(-2) N/m. The radius of the capillary must be:

A capillary tube of radius r can support a liquid of weight 6.28 xx 10

1.	A capillary tube of radius r can support a liquid of weight 6.28 xx 10^(-4) N. If the surface tension of the liquid is 5 xx 10^(-2) N/m. The radius of the capillary must be:
Answer» `2.5xx10^(-4)m` `1.5xx10^(-3)m` `2.0xx10^(-4)m` `2.0xx10^(-3)m` Solution :WEIGHT is balanced by force of surface tension W=T.2`pi`R `rArrr=W/(2piT)=(6.28xx10^(-4))/(2x3.14xx5xx10^(-2))` `=1/5xx10^(-2)=2XX10^(-3)m` Thus the CORRECT choice is (d).

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A capillary tube of radius r can support a liquid of weight 6.28 xx 10^(-4) N. If the surface tension of the liquid is 5 xx 10^(-2) N/m. The radius of the capillary must be:

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