1
Chapter 2.
Electrostatics
Coulombs Law
z
Test
charge
Q
Source
charge
q
r
2
r
y
1 qQ
F=
R
2
4pe 0
x
Separation vector:
= r - r
R = R
The force is repulsive if q and Q have the same sign.
The force is attractive if q and Q have opposite signs.
In S

1
Chapter 5. Magnetostatics
The Lorentz Force Law
Electrostatics The charges (source charges at least) are at rest.
What are the forces between charges in motion?
2
The Lorentz Force Law
The magnetic force on a charge Q moving
with a velocity v in a magne

1
Electromagnetics
Fall - 2014
Lecturer: Mingzhong Wu ()
2
Colorado
State
University
Lecture Time & Textbook
LECTURES:
September 1 October 31
Period 3 and Period 4 on Monday, Room C203 in East 9 Building
Period 5 and Period 6 on Wednesday, Room C202 in Ea

1
Chapter 4. Electric Fields in Matter
Matter comes in two large classes:
(1) Conductors: In conductors there is an unlimited supply of charges that
are free to move about through the material. (Chapter 2 and Chapter 3)
(2) Dielectrics : In dielectric mat

1
Chapter 7. Electrodynamics
Ohms Law
2
J =sE
s is conductivity. r=1/s is the resistivity.
In the past we have used s for surface charge density and r for volume charge density.
SI unit of s : Sm-1 . SI unit of r : Wm.
A more familiar version of Ohms law

1
Chapter 3. Special Techniques
Laplaces Equation
The Method of Images
Separation of Variables
Multi-pole Expansion
Laplaces Equation
E =
1
e0
r (r )
Gausss Law
E = -V
V (r ) = 2
1
e0
r ( r ) Poissons Equation
if r ( r ) = 0
2V ( r ) = 0
Laplaces Equati

1
Chapter 6. Magnetic Fields in Matter
All magnetic phenomena are due to electric
charges in motion.
In a magnetic material, there are tiny currents:
electrons orbiting around nuclei and electrons
spinning about their axes. These current loops
are so smal

1
Chapter 9. Electromagnetic Waves
What is a Wave ?
A wave is a disturbance of a continuous medium that propagates
with a fixed shape at constant velocity.
In the presence of absorption, the wave will diminish in size as it moves.
If the medium is dispe