Question:
The capillaries shown in figure have inner radius $0.5 \mathrm{~mm}, 1.0 \mathrm{~mm}$ and $1.5 \mathrm{~mm}$ respectively. The liquid in the beaker is water. Find the heights of water level in the capillaries. The surface tension of water is $7.5 \times 10^{-2} \mathrm{~N} / \mathrm{m}$.
Solution:
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