What is the diameter of a capillary tube in which mercury is depressed by \( 1.21 \mathrm{~cm} \...

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What is the diameter of a capillary tube in which mercury is depressed by \( 1.21 \mathrm{~cm} \) and surface tension for mercury is \( 540 \times 10^{-3} \mathrm{Nm}^{-1} \) the angle of contact is \( 120^{\circ} \) and density of mercury is \( 13.6 \times 10^{2} \mathrm{~kg} \mathrm{~m}^{-3} \) ?
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