Homework
8
1 A copper wire is
Its diameter is 2 mm and carries
20 A current The conductivity of copper is 5.8 10 Slm Electron
mobility in copper is 0.0032 m Us
2 m long
Find the following
1 Current density
2 Electric field
3 Voltage drop
4 Resistance
5 Chargedensity
6 Drift velocity
7 Time it takes for an electron to travel through the 2m wire
2 Lightning strikes
radius 0.1 m
IMC
a
a sphere not a shell
at t
Determine
for
0
E 1.290
0
10Sfm
uniformly depositing a total charge of
20
E inside the sphere
b E outside the sphere
C
with
J inside the sphere
not a shell