Welcome to Physics 321

1. 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 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. 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. Mechanics! 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 2 1 3rd Law Relativistic Corrections?

7. Special Relativity Galilean Transformations Lorentz Transformations

8. Classical Mechanics Quantum Mechanics (Newton: 1642-1727) (Bohr, Heisenberg, Schrodinger, et al.) Special Relativity Quantum Field Theory (Einstein. 1905 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 (i) (iii) (iv) (ii) Take the curl of the curl, etc. And, you know who said, “Let There Be Light!”

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