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