Question

A glass capillary tube with a diameter of 8.5 mm and length 8 cm is filled with a salt solution with a resistivity of 2.5 ?m. What is the resistance?

Answer 1

The resistance is
`3.5*10^(-4)\ \Omega`

Step-by-step explanation:

Given that,

Diameter of tube = 8.5 mm

Length = 8 cm

Resistivity = 2.5 m

We need to calculate the resistance

The resistance is equal to the product of the resistivity and length divided by the area of cross section .

In mathematical form,

`R = (\rho* l)/(A)`

Where,
`\rho`=resistivity

l = length

A = area of cross section

Put the value into the formula

`R = (2.5*8*10^(-2))/(3.14*((8.5)/(2)*10^(-3))^2)`

`R=3526.32\ \Omega`

`R=3.5*10^(-4)\ \Omega`

Hence, The resistance is
`3.5*10^(-4)\ \Omega`