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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 remain constant.
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Reason: Product of radius of meniscus and height of liquid in the capillary tube always remain constant.
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If both assertion and reason are true and reason is the correct explanation of assertion.
As $h R=\frac{2 S}{\rho g}=$ a finite constant.
Hence when the tube is of insufficient length, 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.
Hence when the tube is of insufficient length, 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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