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Welcome to Physics 321 My Name is Brett Fadem

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

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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. The Distinction between Kinematics and Dynamics.

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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?

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

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

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Galilean TransformationsLorentz Transformations Special Relativity

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Classical MechanicsQuantum Mechanics Special RelativityQuantum Field Theory (Newton: 1642-1727)(Bohr, Heisenberg, Schrodinger, et al.) (Einstein. 1905 was a big year.) (Dirac, Pauli, Feynman, Schwinger, et al.) The Four Forces to Which Mechanics is Applied: 1.Strong 2.Electromagnetic: complete theory in all 4 realms! 3.Weak 4.Gravitational

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

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

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Comparison of Strength of Electromagnetic vs. Gravitational Force Electromagnetism is much stronger! m p =1.67x10 -27 Kg e =1.6x10 -19 C ε o =8.85x10 -12 C 2 /(Nm 2 ) G=6.67x10 -11 (Nm 2 )/Kg 2

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

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

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Gauss’s Law

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Ampere’s Law

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Faraday’s Law

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

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The Electric Field Divergence and Curl of Electrostatic Fields Electric Potential Work and Energy in Electrostatics Conductors 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 Chapter 4 Electric Fields in Matter Polarization The Field of a Polarized Object The Electric Displacement Linear Dielectrics Chapter 5 Magnetostatics The Lorentz Force Law The Biot Savart Law The Divergence and Curl of B Magnetic Vector Potential Chapter 6 Magnetic Fields in Matter Magnetization Field of a Magnetized Object Auxiliary Field H Linear and Nonlinear Media Chapter 7 Electrodynamics Electromotive Force Electromagnetic Induction Maxwell’s Equations Introduction to Electrodynamics

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