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Question

Assertion :A capillary is dipped in a liquid and liquid rises to a height $$h$$ in it. As temperature of the liquid is raised, the height $$h$$ increase (if the density of the liquid and angle of contact remain the same) Reason: Surface tension of a liquid decreases with the rise in its temperature.


A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is incorrect but Reason is correct
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is C Assertion is incorrect but Reason is correct
Assertion is incorrect but the reaton is correct.
We know that,
$$h=\dfrac {2\ T\ \cos \theta}{R \ 1\ g}$$
As the temperature is raised, the surface tension $$(T)$$ decreases.
As a result, the capillary raise $$(h)$$ also decreases if density $$(e)$$ and contact angle $$(\theta)$$ in unaltered.

Physics

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