Physics

Problem

a. (i) Derive an expression for the electron mobility

\mu

of a conductor in terms of its resistivity

\rho

, free-electron number density

n

and electronic charge

e

. b. (ii) Using your result, calculate the mobility of electrons in copper given

\rho=1.7\times10^{-8}\,\Omega\,\text{m}

and

n=8.5\times10^{28}\,\text{m}^{-3}

. (Use

e=1.6\times10^{-19}\,\text{C}