Question

Water rises in a capillary tube to a height $H$,when the capillary tube is vertical. If the same capillary is now inclined to the vertical the length of water column in it will:

• A. Increase
• B. Decrease
• C. will not change
• D. May increase or decrease depending on the angle of inclination.

Answer 1

The correct option is A Increase

In the second case some meas of heater will be balanced by normal reaction of capillary glass apart from surface tension.

height of capillary rise in case 1

$h_1=\frac{2T\sin \theta }{\rho gr}$

when capillary is inverted at angle then
here the gravitation acceleration force is not equal to $g$

the new gravitation acceleration is $=g\sin \varphi$

thus

height in case 2 is

$h_2=\frac{2T\sin \theta }{\rho g\sin \varphi r}$

therefore, $g\sin \varphi <g$

$h_1<h_2$

The length in column increases.

Option A is correct.