Q .     A long glass capillary tube is dipped in
water. It is known that water wets glass.
The water level rises by `h` in the tube. The
tube is now pushed down so that only a
length `h//2` is outside the water surface, The
angle of contact at the water surface at the
upper end of the tube will be

VIT 2013
A

` tan ^(-1) 2`

B

`60^(0)`

C

`30^(0)`

D

`15^(0)`

HINT

`h = (2s costheta)/(rrhog) `

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