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Assertion :When height of a tube is less...

Assertion :When height of a tube is less than liquid rise in the capillary tube, the liquid does not overflow.
Reason : Product of radius of meniscus and height of liquid in the capillary tube always remains constant.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

Text Solution

Verified by Experts

The correct Answer is:
A
`h = (2T)/(Rdg) implies hR = (2T)/(dg) :. hR` = constant
Hence when the tube is of insufficient length, radius of curvature of the liquid meniscus increases, so as to maintain the product hR a finite constant.
i.e. as h decreases, R increases and the liquid meniscus becomes more and more flat, but the liquid does not overflow.
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