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 capillary tube always remains constant.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Both assertion and reason are true and the reason is the correct explanation of assertion.
From equation $h R = \frac{2 S}{ρ g}$ = a finite constant.
When the tube is of insufficient length, a radius of curvature of the liquid meniscus increases, so as to maintain the product $h R$ 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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