Presentation on theme: "Electricity and Magnetism"— Presentation transcript:
1 Electricity and Magnetism Welcome to Physics 321Electricity and MagnetismMy 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.DynamicsDynamics is the study of the causes of motion. Dunamis is the Greek word for power. We call theCauses 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 objectsWhen 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 LawsObjects in motion, remain in motion. Objectsat rest remain at rest.1st Law2nd Law123rd LawRelativistic Corrections?
7 Special RelativityGalilean TransformationsLorentz Transformations
8 Classical MechanicsQuantum Mechanics(Newton: )(Bohr, Heisenberg, Schrodinger, et al.)Special RelativityQuantum Field Theory(Einstein was a big year.)(Dirac, Pauli, Feynman, Schwinger, et al.)The Four Forces to Which Mechanics is Applied:StrongElectromagnetic: complete theory in all 4 realms!WeakGravitational
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 ForceQuantum Chromodynamics “QCD”Strong Force?General RelativityGravity ??“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 Forcemp=1.67x10-27 Kge =1.6x10-19 Cεo=8.85x10-12 C2/(Nm2)G=6.67x10-11 (Nm2)/Kg2Electromagnetism is much stronger!
12 Maxwell’s EquationsGauss’s LawFaraday’s LawAmpere’s Law
13 For Each of Maxwell’s Equations, you should have a simple picture in your mind.
19 Introduction to Electrodynamics Chapter 1Vector AnalysisDifferential CalculusIntegral CalculusCurvilinear CoordinatesThe Dirac Delta FunctionThe Theory of Vector FieldsChapter 2ElectrostaticsChapter 3Special TechniquesLaplace’s EquationThe Method of ImagesSeparation of VariablesMultipole ExpansionsThe Electric FieldDivergence and Curl of Electrostatic FieldsElectric PotentialWork and Energy in ElectrostaticsConductorsChapter 6Magnetic Fields in MatterMagnetizationField of a Magnetized ObjectAuxiliary Field HLinear and Nonlinear MediaChapter 5MagnetostaticsThe Lorentz Force LawThe Biot Savart LawThe Divergence and Curl of BMagnetic Vector PotentialChapter 4Electric Fields in MatterPolarizationThe Field of a Polarized ObjectThe Electric DisplacementLinear DielectricsChapter 7ElectrodynamicsElectromotive ForceElectromagnetic InductionMaxwell’s Equations