Question

A U tube is made of two capillaries of diameter 1.0 mm and 1.5 mm respectively. The
tube is kept vertically and partially filled with water of surface tension 0.0736 N/m and
zero contact angle. Calculate the difference in the levels of miniscii caused by the
capillarit

Answer 1

Explanation:

Rise of water is capillary is H

1

=

ρgd

1

4T

so ΔH=H

1

−H

2

=

ρg

4T

[

d

1

1

−

d

2

1

]

on putting values is SI unit ,d

1

=10

−3

m ,d

2

=10

−2

m

we get ΔH=2.5×10

−2

m or 2.5 cm

so

2

x

=2.cm⇒x=5cm