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A long thin walled capillary tube of mas...

A long thin walled capillary tube of mass M and radius r is partially immersed in a liquid of surface tension T. The angle of contact for the liquid and the tube wall is `30^(@)`. How much force is needed to hold the tube vertically? Neglect buoyancy force on the tube.

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The correct Answer is:
`2sqrt(3)pi rT+Mg`
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