In a capillary rise experiment, the water level rises to a height of 5 cm. If the same capillary tube is placed in water such that only 3 cm of the tube projects outside the water level, then

Options

A. Water will begin to overflow through the capillary
B. Angle of contact decreases
C. Angle of contact increases
D. The meniscus completely vanishes

Answer

C

Explanation

hr = constant
`implies h_1r_1 = h_2r_2`
`implies 5r_1=3r_2 implies r_2 =5/3 r_1`
When radius increases
Angle of contact increases. `" " [:. cos theta =(rghrho)/(2sigma)]`