Which one of the following expresses the height of rise or fall of a liquid in a capillary tube ?(w = Specific weight of the liquid = Angle of contact of the liquid surface = Surface tension)

• A. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/70-1639-1.png">
• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/70-1639-2.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/70-1639-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/70-1639-4.png">