1. Electricity and Magnetism
Welcome to Physics 321
Electricity and Magnetism
My Name is Brett Fadem

2. What is Electrodynamics and How Does it Fit Into The General Scheme
of Physics?
First, what is the distinction between kinematics and dynamics?

3. The Distinction between Kinematics and Dynamics.
Kinematics is the study of motion without regard to the cause. Kinesis is the Greek word for motion.
Dynamics
Dynamics is the study of the causes of motion. Dunamis is the Greek word for power. We call the
Causes of motion, “forces.”
Source: The Dr. Physics Homepage. Please include attributions in your work.

4. But what part of physics studies the resulting motion of objects
So, “electrodynamics” is the study of the electric and magnetic causes of motion (or, electric and magnetic forces).
But what part of physics studies the resulting motion of objects
When acted upon by a force?

5. Describe the force and mechanics will tell you how things move.

6. What do you remember from classical mechanics?
Newton’s Laws
Objects in motion, remain in motion. Objects
at rest remain at rest.
1st Law
2nd Law 1 2
3rd Law
Relativistic Corrections?

7. Special Relativity
Galilean Transformations
Lorentz Transformations

8. Classical Mechanics
Quantum Mechanics
(Newton: )
(Bohr, Heisenberg, Schrodinger, et al.)
Special Relativity
Quantum Field Theory
(Einstein was a big year.)
(Dirac, Pauli, Feynman, Schwinger, et al.)
The Four Forces to Which Mechanics is Applied:
Strong
Electromagnetic: complete theory in all 4 realms!
Weak
Gravitational

9. So, electrodynamics is the study of the electromagnetic force, and mechanics tells us how a system will behave when subjected to that force.

10. Unification? Electricity Electroweak Electromagnetism “QED” Magnetism
Weak Force
Quantum Chromodynamics “QCD”
Strong Force?
General Relativity
Gravity ??
“In this Course, we are going to focus on classical electromagnetism, that is, electromagnetism in the context of classical physics.”

11. Comparison of Strength of Electromagnetic vs. Gravitational
Force
mp=1.67x10-27 Kg
e =1.6x10-19 C
εo=8.85x10-12 C2/(Nm2)
G=6.67x10-11 (Nm2)/Kg2
Electromagnetism is much stronger!

12. Maxwell’s Equations
Gauss’s Law
Faraday’s Law
Ampere’s Law

13. For Each of Maxwell’s Equations, you should have a simple picture in your mind.

14. Gauss’s Law

15. Ampere’s Law

16. Faraday’s Law

17. Maxwell’s Equations in Vacuum
(iii)
(iv)
(ii)
Take the curl of the curl, etc.
And, you know who said,
“Let There Be Light!”

19. Introduction to Electrodynamics
Chapter 1
Vector Analysis
Differential Calculus
Integral Calculus
Curvilinear Coordinates
The Dirac Delta Function
The Theory of Vector Fields
Chapter 2
Electrostatics
Chapter 3
Special Techniques
Laplace’s Equation
The Method of Images
Separation of Variables
Multipole Expansions
The Electric Field
Divergence and Curl of Electrostatic Fields
Electric Potential
Work and Energy in Electrostatics
Conductors
Chapter 6
Magnetic Fields in Matter
Magnetization
Field of a Magnetized Object
Auxiliary Field H
Linear and Nonlinear Media
Chapter 5
Magnetostatics
The Lorentz Force Law
The Biot Savart Law
The Divergence and Curl of B
Magnetic Vector Potential
Chapter 4
Electric Fields in Matter
Polarization
The Field of a Polarized Object
The Electric Displacement
Linear Dielectrics
Chapter 7
Electrodynamics
Electromotive Force
Electromagnetic Induction
Maxwell’s Equations