Q.

A capillary is dipped vertically in a liquid. The level in the capillary will be same as outside the capillary if the angle of contact is:

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a

zero

b

90o

c

acute

d

obtuse

answer is B.

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Detailed Solution

when angle of contact is equal to 900 neither capillary rise nor capillary depression takes place and shape of the meniscus is flat(plane) in the capillary tube.
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