A copper wire of length 1.0 ,m and uniform cross-sectional area 1.0 ,mm carries a…
PHYSICS · Multi-part · CBSE · Physics · Current Electricity · Current Electricity
Problem
A copper wire of length 1.0\,m and uniform cross-sectional area 1.0\,mm2 carries a steady current of 3.0\,A when a potential difference of 2.0\,V is applied between its ends. The number density of free electrons in copper is 8.5×1028m−3.
(i) Calculate the drift velocity of the free electrons in the wire.
(ii) Determine the mobility of the electrons in the wire.
(iii) Using your results, find the resistivity of copper at the given temperature and comment on whether this value depends on the length or area of the wire.