A capillary tube of inside diameter 1mm is dipped vertically into water, so that the length of its part protruding over the water surface is 20mm.What is the radius of curvatur of the meniscus ? Surface tension of water is `72 xx 10^(-3) N//m`.

Explanation

To find the radius of curvature of the meniscus in a capillary tube dipped in water, we can follow these steps:

### Step 1: Determine the Inside Radius of the Capillary Tube
The inside diameter of the capillary tube is given as 1 mm. To find the radius (r1), we can use the formula:
\[ r_1 = \frac{d}{2} \]
where \(d\) is the diameter.
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