2- A copper wire of 3mm diameter with conductivity of 6.7 10' (0.M), and electron mobility of 0.0064 m2 /V sec. Is subjected to an electric field of 30 mV/m. Find (a) the charge density of free electrons, (b) the current density, (c) current flowing in the wire, (d) the electron draft velocity.

a)  

b)  

c)  

d)  

Explanation:

From the question we are told that:

Diameter

Conductivity

Electron mobility

Electric field

a)

Generally the equation for Charge Density is mathematically given by

Therefore

b)

Generally the equation for current density is mathematically given by

c)

Generally the equation for current in wire is mathematically given by

d)

Generally the equation for electron draft velocity. is mathematically given by