Two liquids 
and 
have 
and 
as contact angles in a capillary tube. If 
, then identify the correct statement:
is negative, then liquid 
and liquid 
have concave meniscus. 
has concave meniscus. 
has convex
Text Solution
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The contact angle, 
, of a liquid in a capillary tube determines its meniscus shape:
If 
, then 
and the liquid wets the tube, giving a concave meniscus.
If 
, then 
and the liquid is nonwetting, resulting in a convex meniscus.
If 
, then 
and the meniscus is essentially flat.
We are given the ratio:
For 
to be negative:
The numerator and denominator must have opposite signs.
This means one of the liquids has 
(concave meniscus) and the other has 
(convex meniscus).
Consider Option D:
It states that if 
is negative, then liquid A has a concave meniscus (so 
) and liquid B has a convex meniscus (so 
).
Hence, the ratio becomes negative:
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