A current of 5 A of passes through a copper conductor (resistivity =`1.7xx10^(-8)Omegam)` of radius of cross-section 5 mm.Find the mobility of the charges if their drift velocity is `1.1xx10^(-3)m//s`

Options

A. `1.0 m^2//vs`
B. `1.2 m^2//vs`
C. `1.5 m^2//vs`
D. `1.8 m^2//vs`

Explanation

J= Current density `=E/p` (E= electric field, p=resistive)
`implies E=p.I/A` (I=current) `because` drift velocity `=v_d=mu E`
`implies mu=m obility =V_d/E=(V_dA)/(pI)=(1.1 times 10^-3 times pi times 25 times 10^-6)/(1.7 times 10^-8 times 5) approx 10.15 times 10^-1=1.015m^2//vs`