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Shane Macguire Grade: upto college level
`         The lower end of a capillary tube of radius 1 mm is dipped vertically into mercury. (a) Find the depression of mercury column in the capillary. (b) If the length dipped inside is half the answer of part (a) , find the angle made by the mercury surface at the end of the capillary with the vertical. Surface tension of mercury = 0.465 N m-1 and the contact angle of mercury with glass = 130°.`
3 years ago

396 Points
```										Sol. a) h = 2T cos θ/rpg
b) T * 2πr cos θ = πr2h * p * g
∴ cos θ = hrpg/2T

```
3 years ago
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