经典电动力学

Introduction and Survey 1 I.1 Maxwell Equations in Vacuum, Fields, and Sources 2 I.2 Inverse Square Law, or the Mass of the Photon 5 I.3 Linear Superposition 9 I.4 Maxwell Equations in Macroscopic Media 13 I.5 Boundary Conditions at Interfaces Between Different Media 16 I.6 Some Remarks on Idealizations in Electromagnetism 19 References and Suggested Reading 22 Chapter 1 / Introduction to Electrostatics 24 1.1 Coulomb's Law 24 1.2 Electric Field 24 1.3 Gauss's Law 27 1.4 Differential Form of Gauss's Law 28 1.5 Another Equation of Electrostatics and the Scalar Potential 29 1.6 Surface Distributions of Charges and Dipoles and Discontinuities in the Electric Field and Potential 31 1.7 Poisson and Laplace Equations 34 1.8 Green's Theorem 35 1.9 Uniqueness of the Solution with Dirichlet or Neumann Boundary Conditions 37 1.10 Formal Solution of Electrostatic Boundary-Value Problem with Green Function 38 1.11 Electrostatic Potential Energy and Energy Density; Capacitance 40 .1.12 Variational Approach to the Solution of the Laplace and Poisson Equations 43 1.13 Relaxation Method for Two-Dimensional Electrostatic Problems 47 References and Suggested Reading 50 Problems 50 Chapter 2 / Boundary- Value Problems in Electrostatics: I 57 2.1 Method of Images 57 2.2 Point Charge in the Presence of a Grounded Conducting Sphere 58 2.3 Point Charge in the Presence of a Charged, Insulated, Conducting Sphere 60 2.4 Point Charge Near a Conducting Sphere at Fixed Potential 61 2.5 Conducting Sphere in a Uniform Electric Field by Method of Images 62 2.6 Green Function for the Sphere; General Solution for the Potential 64 2.7 Conducting Sphere with Hemispheres at-Different Potentials 65 2.8 Orthogonal Functions and Expansions 67 2.9 Separation of Variables; Laplace Equation in Rectangular Coordinates 70 2.10 A Two-Dimensional Potential Problem; Summation of Fourier Series 72 2.11 Fields and Charge Densities in Two-Dimensional Corners and Along Edges 75 2.12 Introduction to Finite Element Analysis for Electrostatics 79 References and Suggested Reading 84 Problems 85 Chapter 3/Boundary- Value Problems in Electrostatics: H 95 3.1 Laplace Equation in Spherical Coordinates 95 3.2 Legendre Equation and Legendre Polynomials 96 3.3 Boundary-Value Problems with Azimuthal Symmetry 101 3.4 Behavior of Fields in a Conical Hole or Near a Sharp Point 104 3.5 Associated Legendre Functions and the Spherical Harmonics Ylm(θ,φ) 107 3.6 Addition Theorem for Spherical Harmonics 110 3.7 Laplace Equation in Cylindrical Coordinates; Bessel Functions 111 3.8 Boundary-Value Problems in Cylindrical Coordinates 117 3.9 Expansion of Green Functions in Spherical Coordinates 119 3.10 Solution of Potential Problems with the Spherical Green Function Expansion 112 3.11 Expansion of Green Functions in Cylindrical Coordinates 125 3.12 Eigenfunction Expansions for Green Functions 127 3.13 Mixed Boundary Conditions, Conducting Plane with a Circular Hole 129 References and Suggested Reading 135 Problems 135 Chapter 4/ Multipoles, Electrostatics of Macroscopic Media,Dielectrics 145 4.1 Multipole Expansion 145 4.2 Multipole Expansion of the Energy of a Charge Distribution in an External Field 150 4.3 Elementary Treatment of Electrostatics with Ponderable Media 151 4.4 Boundary-Value Problems with Dielectrics 154 4.5 Molecular Polarizability and Electric Susceptibility 159 4.6 Models for Electric Polarizability 162 4.7 Electrostatic Energy in Dielectric Media 165 References and Suggested Reading 169 Problems 169 Chapter 5/Magnetostatics, Faraday's Law, Quasi-Static Fields 174 5.1 Introduction and Definitions 174 5.2 Blot and Savart Law 175 5.3 Differential Equations of Magnetostatics and Ampere's Law 178 5.4 Vector Potential 180 5.5 Vector Potential and Magnetic Induction for a Circular Current Loop 181 5.6 Magnetic Fields of a Localized Current Distribution, Magnetic Moment 184 5.7 Force and Torque on and Energy of a Localized Current Distribution in an External Magnetic Induction 188 5.8 Macroscopic Equations, Boundary Conditions on B and H 191 5.9 Methods of Solving Boundary-Value Problems in Magnetostatics 194 5.10 Uniformly Magnetized Sphere 198 5.11 Magnetized Sphere in an External Field; Permanent Magnets 199 5.12 Magnetic Shielding, Spherical Shell of Permeable Material in a Uniform Field 201 5.13 Effect of a Circular Hole in a Perfectly Conducting Plane with an Asymptotically Uniform Tangential Magnetic Field on One Side 203 5.14 Numerical Methods for Two-Dimensional Magnetic Fields 206 5.15 Faraday's Law of Induction 208 5.16 Energy in the Magnetic Field 212 5.17 Energy and Self-and Mutual Inductances 215 5.18 Quasi-Static Magnetic Fields in Conductors; Eddy Currents; Magnetic Diffusion 218 References and Suggested Reading 223 Problems 225 Chapter 6 / Maxwell Equations, Macroscopic Electromagnetism,Conservation Laws 237 6.1 Maxwell's Displacement Current; Maxwell Equations 237 6.2 Vector and Scalar Potentials 239 6.3 Gauge Transformations, Lorenz Gauge, Coulomb Gauge 240 6.4 Green Functions for the Wave Equation 243 6.5 Retarded Solutions for the Fields: Jefimenko's Generalizations of the Coulomb and Biot-Savart Laws; Heaviside-Feynman Expressions for Fields of Point Charge 246 6.6 Derivation of the Equations of Macroscopic Electromagnetism 248 6.7 Poynting's Theorem and Conservation of Energy and Momentum for a System of Charged Particles and Electromagnetic Fields 258 6.8 Poynting's Theorem in Linear Dissipative Media with Losses 262 6.9 Poynting's Theorem for Harmonic Fields; Field Definitions of Impedance and Admittance 264 6.10 Transformation Properties of Electromagnetic Fields and Sources Under Rotations, Spatial Reflections, and Time Reversal 267 6.11 On the Question of Magnetic Monopoles 273 6.12 Discussion of the Dirac Quantization Condition 275 6.13 Polarization Potentials (Hertz Vectors) 280 References and Suggested Reading 282 Problems 283 Chapter 7 / Plane Electromagnetic Waves and Wave Propagation 295 7.1 Plane Waves in a Nonconducting Medium 295 7.2 Linear and Circular Polarization; Stokes Parameters 299 7.3 Reflection and Refraction of Electromagnetic Waves at a Plane Interface Between Two Dielectrics 302 7.4 Polarization by Reflection, Total Internal Reflection; Goos-Hanchen Effect 306 7.5 Frequency Dispersion Characteristics of Dielectrics, Conductors, and Plasmas 309 7.6 Simplified Model of Propagation in the Ionosphere and Magnetosphere 316 7.7 Magnetohydrodynamic Waves 319 7.8 Superposition of ,Waves in One Dimension; Group Velocity 322 7.9 Illustration of the Spreading of a Pulse As It Propagates in a Dispersive Medium 326 7.10 Causality in the Connection Between D and E; Kramers-Kronig Relations 330 7.11 Arrival of a Signal After Propagation Through a Dispersive Medium 335 References and Suggested Reading 339 Problems 340 Chapter 8 / Waveguides, Resonant Cavities, and Optical Fibers 352 8.1 Fields at the Surface of and Within a Conductor 352 8.2 Cylindrical Cavities and Waveguides 356 8.3 Waveguides 359 8.4 Modes in a Rectangular Waveguide 361 8.5 Energy Flow and Attenuation in Waveguides 363 8.6 Perturbation of Boundary Conditions 366 8.7 Resonant Cavities 368 8.8 Power Losses in a Cavity; Q of a Cavity 371 8.9 Earth and Ionosphere as a Resonant Cavity: Schumann Resonances 374 8.10 Multimode Propagation in Optical Fibers 378 8.11 Modes in Dielectric Waveguides 385 8.12 Expansion in Normal Modes; Fields Generated by a Localized Source in a Hollow Metallic Guide 389 References and Suggested Reading 395 Problems 396 Chapter 9/Radiating Systems, Multipole Fields and Radiation 407 9.1 Fields and Radiation of a Localized Oscillating Source 407 9.2 Electric Dipole Fields and Radiation 410 9.3 Magnetic Dipole and Electric Quadrupole Fields 413 9.4 Center-Fed Linear Antenna 416 9.5 Multipole Expansion for Localized Source or Aperture in Waveguide 419 9.6 Spherical Wave Solutions of the Scalar Wave Equation 425 9.7 Multipole Expansion of the Electromagnetic Fields 429 9.8 Properties of Multipole Fields, Energy and Angular Momentum of Multipole Radiation 432 9.9 Angular Distribution of Multipole Radiation 437 9.10 Sources of Multipole Radiation; Multipole Moments 439 9.11 Multipole Radiation in Atoms and Nuclei 442 9.12 Multipole Radiation from a Linear, Center-Fed Antenna 444 References and Suggested Reading 448 Problems 449 Chapter 10 / Scattering and Diffraction 456 10.1 Scattering at Long Wavelengths 456 10.2 Perturbation Theory of Scattering, Rayleigh's Explanation of the Blue Sky, Scattering by Gases and Liquids, Attenuation in Optical Fibers 462 10.3 Spherical Wave Expansion of a Vector Plane Wave 471 10.4 Scattering of Electromagnetic Waves by a Sphere 473 10.5 Scalar Diffraction Theory 478 10.6 Vector Equivalents of the Kirchhoff Integral 482 10.7 Vectorial Diffraction Theory 485 10.8 Babinet's Principle of Complementary Screens 488 10.9 Diffraction by a Circular Aperture; Remarks on Small Apertures 490 10.10 Scattering in the Short-Wavelength Limit 495 10.11 Optical Theorem and Related Matters 500 References and Suggested Reading 506 Problems 507 Chapter 11/Special Theory of Relativity 514 11.1 The Situation Before 1900, Einstein's Two Postulates 515 11.2 Some Recent Experiments 518 11.3 Lorentz Transformations and Basic Kinematic Results of Special Relativity 524 11.4 Addition of Velocities; 4-Velocity 530 11.5 Relativistic Momentum and Energy of a Particle 533 11.6 Mathematical Properties of the Space-Time of Special Relativity 539 11.7 Matrix Representation of Lorentz Transformations, Infinitesimal Generators 543 11.8 Thomas Precession 548 11.9 Invariance of Electric Charge; Covariance of Electrodynamics 553 11.10 Transformation of Electromagnetic Fields 558 11.11 Relativistic Equation of Motion for Spin in Uniform or Slowly Varying External Fields 561 11.12 Note on Notation and Units in Relativistic Kinematics 565 References and Suggested Reading 566 Problems 568 Chapter 12/Dynamics of Relativistic Particles and Electromagnetic Fields 579 12.1 Lagrangian and Hamiltonian for a Relativistic Charged Particle in External Electromagnetic Fields 579 12.2 Motion in a Uniform, Static Magnetic Field 585 12.3 Motion in Combined, Uniform, Static Electric and Magnetic Fields 586 12.4 Particle Drifts in Nonuniform, Static Magnetic Fields 588 12.5 Adiabatic Invariance of Flux Through Orbit of Particle 592 12.6 Lowest Order Relativistic Corrections to the Lagrangian for Interacting Charged Particles: The Darwin Lagrangian 596 12.7 Lagrangian for the Electromagnetic Field 598 12.8 Proca Lagrangian; Photon Mass Effects 600 12.9 Effective "Photon" Mass in Superconductivity; London Penetration Depth 603 12.10 Canonical and Symmetric Stress Tensors; Conservation Laws 605 12.11 Solution of the Wave Equation in Covariant Form; Invariant Green Functions 612 References and Suggested Reading 615 Problems 617 Chapter 13/Collisions, Energy Loss, and Scattering of Charged Particles,Cherenkov and Transition Radiation 624 13.1 Energy Transfer in Coulomb Collision Between Heavy Incident Particle and Free Electron; Energy Loss in Hard Collisions 625 13.2 Energy Loss from Soft Collisions; Total Energy Loss 627 13.3 Density Effect in Collisional Energy Loss 631 13.4 Cherenkov Radiation 637 13.5 Elastic Scattering of Fast Charged Particles by Atoms 640 13.6 Mean Square Angle of Scattering; Angular Distribution of Multiple Scattering 643 13.7 Transition Radiation 646 References and Suggested Reading 654 Problems 655 Chapter 14/Radiation by Moving Charges 661 14.1 Lienard-Wiechert Potentials and Fields for a Point Charge 661 14.2 Total Power Radiated by an Accelerated Charge: Larmor's Formula and Its Relativistic Generalization 665 14.3 Angular Distribution of Radiation Emitted by an Accelerated Charge 668 14.4 Radiation Emitted by a Charge in Arbitrary, Extremely Relativistic Motion 671 14.5 Distribution in Frequency and Angle of Energy Radiated by Accelerated Charges: Basic Results 673 14.6 Frequency Spectrum of Radiation Emitted by a Relativistic Charged Particle in Instantaneously Circular Motion 676 14.7 Undulators and Wigglers for Synchrotron Light Sources 683 14.8 Thomson Scattering of Radiation 694 References and Suggested Reading 697 Problems 698 Chapter 15 / Bremsstrahlung, Method of Virtual Quanta,Radiative Beta Processes 708 15.1 Radiation Emitted During Collisions 709 15.2 Bremsstrahlungin Coulomb Collisions 714 15.3 Screening Effects; Relativistic Radiative Energy Loss 721 15.4 Weizsficker-Williams Method of Virtual Quanta 724 15.5 Bremsstrahlung as the Scattering of Virtual Quanta 729 15.6 Radiation Emitted During Beta Decay 730 15.7 Radiation Emitted During Orbital Electron Capture: Disappearance of Charge and Magnetic Moment 732 References and Suggested Reading 737 Problems 737 Chapter 16 / Radiation Damping, Classical Models of Charged Particles 745 16.1 Introductory Considerations 745 16.2 Radiative Reaction Force from Conservation of Energy 747 16.3 Abraham-Lorentz Evaluation of the Self-Force 750 16.4 Relativistic Covariance; Stability and Poincar6 Stresses 755 16.5 Covariant Definitions of Electromagnetic Energy and Momentum 757 16.6 Covariant Stable Charged Particle 759 16.7 Level Breadth and Level Shift of a Radiating Oscillator 763 16.8 Scattering and Absorption of Radiation by an Oscillator 766 References and Suggested Reading 768 Problems 769 Appendix on Units and Dimensions 775 1 Units and Dimensions, Basic Units and Derived Units 775 2 Electromagnetic Units and Equations 777 3 Various Systems of Electromagnetic Units 779 4 Conversion of Equations and Amounts Between SI Units and Gaussian Units 782 Bibliography 785 Index 791

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