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11 電磁 IV. How did the electric guitar revolutionize rock? From acoustic to electric guitars. Sections. 電磁感應 物質的磁性 麥斯威爾方程式 電磁波 Lasers and X-rays. 11-1.1 Two symmetric Situations. current loop + magnetic field → torque torque + magnetic field → current. - PowerPoint PPT Presentation
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11 IV How did the electric guitar revolutionize rock?From acoustic to electric guitars
SectionsLasers and X-rays
11-1.1 Two symmetric Situationscurrent loop + magnetic field torquetorque + magnetic field current
11-1.2 Two ExperimentsFirst Experiment A Magnet is moving with respect to the loop.
Second Experiment
The switch S is closed or opend.
11-1.3 Faradays Law of InductionAn emf is induced when the number of magnetic field lines that pass through the loop is changing. A Quantitative Treatment The magnetic flux
Faradays law
1 A solenoid contains a coili =1.5 A n = 2.2104 turns / mA = 3.46 10-4m2 N = 130 turns25ms0
i =1.5 A n = 2.2104 turns / mA = 3.46 10-4m2 N = 130 turns25ms0
11-1.4 Lenzs LawOpposition to pole MovementOpposition to flux changeElectric Guitars
2 B = 4.0 t2 +2.0 t + 3.0 Ebat = 2.0V r = 0.20m
EMBED Equation.2
_988006547.unknown
_1244752913.unknown
3 B = 4 t2 x2W = 3.0m H = 2.0m t = 0.1s
EMBED Equation.2
_1244724452.unknown
_1244752930.unknown
11-1.5 Induction and Energy Transfers The work done by the applied force and the thermal energy produced in the wire.
The Power
Eddy currents induction stoves and EM braking
Eddy currents transformers
Eddy currents EM braking
Eddy currents metal detectors
The microphone
The tape recorder
Speaker
Voice-coil positioner of a HDD
11-2.1 Magnetism of MatterHow can a clay-walled kiln reveal Earths magnetic field of the past?
The earths dipole field The mid-atlantic ridge 11-2.2 The Magnetic field of the Earth
11-2.3 Magnetic MaterialsDiamagnetism ()Paramagnetism ()Ferromagnetism ()
32-6 Diamagnetism
11-2.4 Diamagnetism
11-2.5 Paramagnetism
11-2.6 Ferromagnetism(magnetic domain)
Hysteresis ()
11-3.1 Maxwells Equations
11-3.2 () ()
11-3.3 Magnets and magnetic flux () Magnetic dipole: north/south pole
11-3.4 Gauss Law for Magnetic Fields The net magnetic flux thru any closed Gaussian surface is zero.
11-3.5 Gauss Law for electric Fields Flux enclosed charge
11-3.6 Induced Magnetic Fields 3 ways to produce a magnetic field: by an electric current, by a magnetic material, and by induction.
11-3.7 Induced Magnetic Fields
11-3.8 Displacement Current
11-3.9 Maxwells Equations
11-4.1 Electromagnetic WavesThe Oscillating E and B FieldsA Most Curious Wave The ether ()
Light Electromagnetic WavesHertz () Radio WavesThe Electromagnetic SpectrumThe Relative Sensitivity of Human eyes 430nm 690nm11-4.2 Characteristics
11-4.3 Maxwells Rainbow
11-4.4 CometsWhat shapes the curved dust tail of a comet?
11-4.5 Polarization ()Polarized LightThe Plane of PolarizationLinear, Circular and Elliptical polarization
Polarization of Light
11-4.6 Liquid Crystal - I
Liquid Crystal - II
Liquid Crystal - III
LCD Liquid Crystal Display
11-4.7 Reflection and Refraction ()
The Index of Refraction
The Stealth Aircraft F-117A
11-4.8 Chromatic Dispersion prisms and gratings
Rainbows
11-4.9 Diffraction ()
Why do the colors in a pointillism painting change with viewing distance?
The Fresnel Bright Spot (1819) Newton Poisson Fresnel
Double-slit diffraction (with interference)Single-slit diffraction
X-ray Diffraction
Braggs Law
11-5.1 Theory of Lasers
He-Ne Lasers
Applications of Lasers
Compact Disc
11-5.2 Theory of X-ray
X
Medical X-rays
2D and 3D X-ray Images
!
(0.3m)(1mm)Metastable states: 10-3 s vs 10-8 sHe: 20.61eV neon:20.66 eV / 18.70 eVBarcode scanning, CO2 laser welding and retina surgery
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