When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the capillary.
A. The surface tension of the liquid must be zero.
B. The contact angle must be 90o.
C. The surface tension may be zero
D. The contact angle may be 90o.
If the level of liquid does not rise, it may be assumed that the surface tension is zero or the angle of contact is 90°, or both. Although it cannot be said with certainty whether the surface tension or the angle of contact is 90°.
Hence, both the option C and D is correct.
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