Fundamentals of Physics II: Electromagnetism, Optics, and Quantum Mechanics

Fundamentals of Physics II: Electromagnetism, Optics, and Quantum Mechanics

by R. Shankar
Fundamentals of Physics II: Electromagnetism, Optics, and Quantum Mechanics

Fundamentals of Physics II: Electromagnetism, Optics, and Quantum Mechanics

by R. Shankar

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Overview

A beloved introductory physics textbook, now including exercises and an answer key, accessibly explains electromagnetism, optics, and quantum mechanics

R. Shankar is a well‑known physicist and contagiously enthusiastic educator, whose popular online introductory-physics video lectures have been viewed over a million times. In this second book based on his online courses, Shankar explains electromagnetism, optics, and quantum mechanics, developing the basics and reinforcing the fundamentals. With the help of problem sets and answer keys, students learn about the most interesting findings of today’s research while gaining a firm foundation in the principles and methods of physics.

Product Details

ISBN-13: 9780300221152
Publisher: Yale University Press
Publication date: 07/19/2016
Series: Open Yale Courses Series
Sold by: Barnes & Noble
Format: eBook
Pages: 512
Sales rank: 1,014,460
File size: 32 MB
Note: This product may take a few minutes to download.

About the Author

R. Shankar is the Josiah Willard Gibbs Professor of Physics at Yale University. He is the 2009 winner of the American Physical Society’s Lilienfeld Prize and the author of four previous popular textbooks.

Table of Contents

Preface xv

1 Electrostatics I 1

1.1 Review of F = ma 1

1.2 Enter electricity 3

1.3 Coulomb's law 8

1.4 Properties of charge 10

1.4.1 Superposition principle 12

1.5 Verifying Coulomb's law 13

1.6 The ratio of gravitational to electric forces 15

1.7 Coulomb's law for continuous charge density 17

2 The Electric Field 19

2.1 Review of key ideas 19

2.2 Digression on nuclear forces 20

2.3 The electric field E 22

2.4 Visualizing the field 25

2.5 Field of a dipole 33

2.5.1 Far field of dipole: general case 36

2.6 Response to a field 38

2.6.1 Dipole in a uniform field 39

3 Gauss's Law I 42

3.1 Field of an infinite line charge 43

3.2 Field of an infinite sheet of charge 47

3.3 Spherical charge distribution: Gauss's law 52

3.4 Digression on the area vector dA 53

3.4.1 Composition of areas 55

3.4.2 An application of the area vector 57

3.5 Gauss's law through pictures 59

3.5.1 Continuous charge density 64

4 Gauss's Law II: Applications 65

4.1 Applications of Gauss's law 66

4.2 Field inside a shell 69

4.3 Field of an infinite charged wire, redux 72

4.4 Field of an infinite plane, redux 74

4.5 Conductors 75

4.5.1 Field inside a perfect conductor is zero 76

4.5.2 The net charge on a conductor will reside at the surface 77

4.5.3 A conductor with a hole inside 78

4.5.4 Field on the surface of a conductor 79

5 The Coulomb Potential 81

5.1 Conservative forces and potential energy 82

5.2 Is the electrostatic field conservative? 88

5.3 Path independence through pictures 92

5.4 Potential and field of a dipole 93

6 Conductors and Capacitors 97

6.1 Cases where computing V from E is easier 99

6.2 Visualizing V 101

6.3 Equipotentials 103

6.4 Method of images 104

6.4.1 Proof of uniqueness (optional section) 110

6.4.2 Additional properties of the potential V(r) 112

6.5 Capacitors 113

6.6 Energy stored in a capacitor 115

6.7 Energy of a charge distribution 116

7 Circuits and Currents 119

7.1 Energy in the electric field 120

7.2 Circuits and conductivity 121

7.3 Circuits 126

7.4 The battery and the EMF ε 130

7.5 The RC circuit with a battery 135

7.6 Miscellaneous circuits 138

8 Magnetism I 142

8.1 Experiments pointing to magnetism 142

8.2 Examples of the Lorentz force, the cyclotron 147

8.3 Lorentz force on current-carrying wires 151

8.4 The magnetic dipole 154

8.5 The DC motor 156

9 Magnetism II: Biot-Savart Law 158

9.1 Practice with Biot-Savart: field of a loop 160

9.2 Microscopic description of a bar magnet 162

9.3 Magnetic field of an infinite wire 164

9.4 Ampére's law 167

9.5 Maxwell's equations (static case) 172

10 Ampère II, Faraday, and Lenz 174

10.1 Field of an infinite wire, redux 175

10.2 Field of a solenoid 179

10.3 Faraday and Lenz 184

10.4 Optional digression on Faraday's law 195

11 More Faraday 200

11.1 Betatron 200

11.2 Generators 205

11.3 Inductance 208

11.4 Mutual inductance 211

11.5 Self-inductance 214

11.6 Energy in the magnetic field 217

12 AC Circuits 220

12.1 Review of inductors 226

12.2 The LC circuit 226

12.2.1 Driven LC circuit 229

12.3 The LCR circuit 231

12.3.1 Review of complex numbers 231

12.3.2 Solving the LCR equation 236

12.3.3 Visualizing Z 239

12.4 Complex form of Ohm's law 241

13 LCR Circuits and Displacement Current 244

13.1 Analysis of LCR results 246

13.1.1 Transients and the complementary solution 251

13.2 Power of the complex numbers 253

13.3 Displacement current 259

14 Electromagnetic Waves 263

14.1 The wave equation 266

14.2 Restricted Maxwell equations in vacuum 270

14.2.1 Maxwell equations involving infinitesimal cubes 270

14.2.2 Maxwell equations involving infinitesimal loops 272

14.3 The wave! 275

14.4 Sinusoidal solution to the wave equation 277

14.5 Energy in the electromagnetic wave 283

14.6 Origin of electromagnetic waves 285

14.7 Maxwell equations-the general case (optional) 286

14.7.1 Maxwell equations involving infinitesimal cubes 286

14.7.2 Maxwell equations involving infinitesimal loops 288

14.7.3 Consequences for the restricted E and B 293

14.8 From microscopic to macroscopic (optional) 294

14.8.1 Maxwell equations involving cubes 295

14.8.2 Maxwell equations involving loops 297

15 Electromagnetism and Relativity 300

15.1 Magnetism from Coulomb's law and relativity 301

15.2 Relativistic invariance of electrodynamics 305

15.3 Review of Lorentz transformations 305

15.3.1 Implications for Newtonian mechanics 307

15.4 Scalar and vector fields 309

15.5 The derivative operator 312

15.6 Lorentz scalars and vectors 315

15.7 The four-current J 317

15.7.1 Charge conservation and the four-current J 318

15.8 The four-potential A 319

15.8.1 Gauge invariance 322

15.9 Wave equation for the four-vector A 324

15.9.1 Why work with Vand A? 327

15.10 The electromagnetic tensor F 328

15.10.1 Tensors 328

15.10.2 The electromagnetic field tensor F 332

16 Optics I: Geometric Optics Revisited 336

16.1 Geometric or ray optics 336

16.2 Brief history of c 338

16.3 Some highlights of geometric optics 340

16.4 The law of reflection from Fermat's principle 343

16.5 Snell's law from Fermat's principle 344

16.6 Reflection off a curved surface by Fermat 346

16.7 Elliptical mirrors and Fermat's principle 349

16.8 Parabolic mirrors 352

17 Optics II: More Mirrors and Lenses 355

17.1 Spherical approximations to parabolic mirrors 355

17.2 Image formation: geometric optics 357

17.2.1 A midlife crisis 359

17.3 Image formation by Fermat's principle 360

17.4 Tricky cases 364

17.4.1 Fermat's principle for virtual focal points 365

17.4.2 Ray optics for virtual images 366

17.5 Lenses à la Fermat 368

17.6 Principle of least action 370

17.7 The eye 372

18 Wave Theory of Light 377

18.1 Interference of waves 381

18.2 Adding waves using real numbers 383

18.3 Adding waves with complex numbers 385

18.4 Analysis of interference 388

18.5 Diffraction grating 394

18.6 Single-slit diffraction 397

18.7 Understanding reflection and crystal diffraction 398

18.8 Light incident on an oil slick 401

18.8.1 Normal incidence 401

18.8.2 Oblique incidence 404

19 Quantum Mechanics: The Main Experiment 406

19.1 Double-slit experiment with light 407

19.2 Trouble with Maxwell 407

19.3 Digression on photons 412

19.3.1 Photoelectric effect 412

19.3.2 Compton effect 414

19.4 Matter waves 415

19.5 Photons versus electrons 420

19.6 The Heisenberg uncertainty principle 422

19.6.1 There are no states of well-defined position and momentum 423

19.6.2 Heisenberg microscope 427

19.7 Let there be light 430

19.8 The wave function Ψ 435

19.9 Collapse of the wave function 438

19.10 Summary 439

20 The Wave Function and Its Interpretation 442

20.1 Probability in classical and quantum mechanics 446

20.2 Getting to know Ψ 451

20.3 Statistical concepts: mean and uncertainty 456

21 Quantization and Measurement 460

21.1 More on momentum states 462

21.2 Single-valuedness and quantization of momentum 464

21.2.1 Quantization 467

21.2.2 The integral of Ψp(x) 468

21.3 Measurement postulate: momentum 469

21.3.1 An example solvable by inspection 476

21.3.2 Using a normalized Ψ 478

21.4 Finding A(p) by computation 480

21.5 More on Fourier's theorems 486

21.6 Measurement postulate: general 491

21.7 More than one variable 493

22 States of Definite Energy 495

22.1 Free particle on a ring 500

22.1.1 Analysis of energy levels: degeneracy 503

22.2 Thinking inside the box 507

22.2.1 Particle in a well 507

22.2.2 The box: an exact solution 516

22.3 Energy measurement in the box 521

23 Scattering and Dynamics 524

23.1 Quantum scattering 524

23.1.1 Scattering for E > V0 526

23.1.2 Scattering for E < V0 530

23.2 Tunneling 531

23.3 Quantum dynamics 533

23.3.1 A solution of the time-dependent Schrödinger equation 535

23.3.2 Derivation of the particular solution ΨE(x,t) 536

23.4 Special properties of the product solution 538

23.5 General solution for time evolution 541

23.5.1 Time evolution: a more complicated example 545

24 Summary and Outlook 550

24.1 Postulates: first pass 550

24.2 Refining the postulates 554

24.2.1 Toward a compact set of postulates 555

24.2.2 Eigenvalue problem 556

24.2.3 The Dirac delta function and the operator X 558

24.3 Postulates: final 565

24.4 Many particles, bosons, and fermions 566

24.4.1 Identical versus indistinguishable 567

24.4.2 Implications for atomic structure 574

24.5 Energy-time uncertainty principle 576

24.6 What next? 583

Constants 585

Index 587

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