PYSICS 30471 Electricity & Magnetism
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Transcript of PYSICS 30471 Electricity & Magnetism
PYSICS 30471Electricity & Magnetism
Tuesday and Thursday 12:30-1:45
At DeBartolo, Room 119
By Prof. S. Frauendorf
125 NSH 1-3875 [email protected]
Office hours: Tuesday and Thursday 10:30-11:30
Homework:Every week, due on Tuesdays by 16:00.Will be provided as MS doc file in the 30471 course space.Late homework policy: Turned in within the week of the deadline: 75%within the following week: 50%later: 0%Graded HW back after 2 weeks.
Midterm Exam 30%Final Exam 40%Homework 30%
Grade
Grades available on WebCT
Teaching assistant: Sun Jie(Jason) , room 120 tel.:1-4743 [email protected]
StyleCombination of Powerpoint slides containing the most important resultsavailable in the course space phys30471.01I:\coursefa.06\phys\phys30471.01and handwritten notes derivations, explanations, …
SyllabusText: Introduction to Electrodynamics, David J. Griffiths, (3rd ed. 1999 ), Chapters 1-7
1. Vector Analysis2. Electrostatics3. Special Techniques4. Electric Fields in Matter5. Magnetostatics6. Magnetic Fields in Matter7. Electrodynamics
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What is electrodynamics, and how does it fit into the general scheme of physics?
Natural phenomena are governed by the electromagnetic interaction.
It governs our man-made world as well.
It keeps the molecules together.
Even where you do not expect it, the electromagnetic interaction is at work.
Mechanics tells us the reaction of a body to a force.
Forces are given.
Electromagnetism is the theory two types of forces:Electric forceMagnetic force
Classical MechanicsNewton
Quantum Field TheoryDirac, Pauli, Feynman,Schwinger, ….
Quantum MechanicsBohr, Heisenberg,Schrödinger, …
small
Special RelativityEinstein
fast
Electric Charge (q, Q)
1. Charge exists as +q and –q. At the same point: +q-q=02. Charge is conserved (locally).3. Charge is quantized. +q =n (+e), -q = m (-e), m, n, integer
electron: –e, positron: +e, proton: +e, C-nucleus: 6(+e)Charge conservation in the micro world: p + e -> n (electron capture)
Macro world: q ~ 2310 e
Quantization is unimportant. Imagine charge as some kind of jelly.
The Field Formulation
q qF
E
q
v = cLight wave
Four kinds of forces - interactions
1. Strong Keeps nuclei and nucleons together. 2. Electromagnetic Most common phenomena.3. Weak β-decay n->p+e+ν4. Gravitational Keeps the Universe together.
Unification
electric + magnetic electromagnetic
electrodynamic + weak electroweak
electromagnetic + optic electrodynamic
In Quantum Field theory the difference between particlesand forces becomes ratherdiffuse.
Two types of quantum particles:Fermions and Bosons.
SI-UnitsSysteme Internationale
Mechanicslength: meter (m) mass: kilogram (kg)time: second (s)force: newton ( )2 smkgNwork: joule (J = N m)Power: watt (W = J/s)
Electromagnetismcurrent: ampere (A)charge: coulomb (C = As)voltage: volt (V )
work: (W s = V A s)power: watt (W = V A)
The equations of EM contain
As
Vm
C
Nm
cAm
Vs
Vm
As 92
29
02
0
70
120 109109
4
1,
1104,10859.8