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Question

Two capillaries made of the same material with radii $$r_{1}=1\ mm$$ and $$r_{2}=2\ mm$$. The rise of the liquid in one capillary ($$r_{1}=1\ mm$$) is $$30\ cm$$, then the rise in the other will be


A
7.5 cm
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B
60 cm
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C
15 cm
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D
120 cm
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Solution

The correct option is C $$15\ cm$$
As we know,

$$\dfrac{h_{2}}{h_{1}}=\dfrac{r_{1}}{r_{2}}=\dfrac{1}{2}$$
$$\Rightarrow h_{2}=\dfrac{30}{2}=15cm$$

Physics

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