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The radii of the columns in U- tube are r1 and r2. when a liquid of density p (angle of contact is 0) is filled in it in the level difference of liquid in two arms is h. The surface tension of liquid is : (g= acceleration due to gravity)

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Solution

Rise of liquid in the capillare tube n
given m
h=2Trpg
h1 is height of tube of radius r1
h2 is height of tube of radius r2
h1=2Tr1pg
h2=2Tr2pg
h=h1h2=2Tr1pg2Tr2pg=2Tpg[1r11r2]
h=2Tpg[r2r1r1r2]
T=hpgr1r22(r2r1)

1381444_1213668_ans_86acd31ba3014b60a720b2a61ce32117.JPG

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