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Chapter 18: Q7Q (page 755)

There are very roughly the same number of iron atoms per m3 as there are copper atoms per m3 , but copper is a much better conductor than iron. How does uiron compare with ucopper?

Short Answer

Expert verified

The ucopper is greater than uiron

Step by step solution

01

Given data

Copper is a better conductor than iron.

02

Define the concept for the mobility

The mobility in a conductor of cross sectional area A and n number of atoms per unit volume, through which a current i passes on application of electric field E, is defined as follows:

u=inAE ..... (i)

03

Determine the mobility of copper to that of iron

From equation (i) it is evident that for equal number density, area and applied electric field, the conductor which allows more current has better mobility that is the material which is more conducting has larger mobility. Thus, copper has larger mobility that is given as:

ucopper>uiron

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