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Question

Two capillary tubes of same diameter are put vertically one each in two liquids whose relative densities are 0.8 and 0.6 and surface tensions are 60 and 50dyne/cm respectively. Ratio of heights of liquids in the two tubes h1/h2 is____

A
109
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B
310
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C
103
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D
910
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Solution

The correct option is D 910
h=2Tcosθϱgr
hαTϱ
So, h1h2=T1×ϱ2ϱ1×T2=60×0.60.8×50=3640=910

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