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The angle of contact between glass and w...

The angle of contact between glass and water is `0^@` and surface tension is `70 dyn//cm`. Water rises in a glass capillary up to `6 cm`. Another liquid of surface tension `140 dyn//cm`, angle of contact `60^@` and relative density `2` will rise in the same capillary up to

A

12 cm

B

24 cm

C

3 cm

D

6 cm

Text Solution

Verified by Experts

The correct Answer is:
C
` (h_2 )/(h_1 ) = ( sigma _ 2 cos theta _ 2 ) /( rho _2 ) xx ( rho _ 1 )/( sigma _1 cos theta _ 1 ) (h _ 2 )/(h _ 1 ) = (140 xx (1)/(2))/( 2 ) xx (1)/(70 xx 1 ) rArr h _ 2 = (h _ 1)/(2 ) = (6)/(2) = 3 `
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