10 電磁 III How is an aurora so thin yet so tall and wide?
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Transcript of 10 電磁 III How is an aurora so thin yet so tall and wide?
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10 III How is an aurora so thin yet so tall and wide?
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Sections
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10-1 The electric field and the magnetic fieldElectromagnets and permanent magnets
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10-1.1 The definition of B
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The tracks in a bubble chamber
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The SI unit for B1 tesla = 1T =1 N/Am=104 gauss
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Magnetic Field Lines Magnetic vs. electric dipoles A horseshoe and a C-shaped magnets
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1 A 5.3 MeV proton
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10-1.2 Crossed Fields: Discovery of the ElectronA cathode ray tube Thomsons procedure:E = 0, B = 0, ,
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Calculation
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10-1.3 Crossed Fields: The Hall EffectBy the conduction electrons in copper:
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2 A cube generator
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10-1.4 A Circulating Charged Particle
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The frequency and angular frequency
Helical Paths
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3 The Mass Spectrometer ()
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Isotope Separation
Centrifuge and diffusion chamber
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The pitch () of the helical path
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10-1.5 Cyclotrons and SynchrotronsFermilab: 6.3km ring ()
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SynchrotronsThe resonance condition:When proton energy > 50Mev:Out of resonance (relativistic effect) A huge magnet (4106 m2) is needed for high energy (500Gev) protons The proton sychrotron at Fermilab can produces 1Tev proton
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10-1.6 Magnetic Force on a Current-Carrying Wire
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For a wire segment: Magnetic Force
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4 A length of wire with a semicircular arc
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Calculation
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10-1.7 Torque on A Current LoopF2 and F4 cancel F1 and F3 form a force couple
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5 A galvanometer for analog meters
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10-1.8 The Magnetic DipoleThe magnetic dipole moments
The magnetic potential energy
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10-2 Magnetic Fields due to CurrentsConventional rocket EM Rail Gun
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10-2.1 Calculating the Magnetic Field due to a currentThe law of Biot and Savart
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Magnetic Field Due to a Current in a Long Straight Wire
_987871362.unknown
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Integration
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Magnetic Field Due to a Current in a Circular Arc of Wire
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6 What B does the current produce?
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10-2.2 Two Parallel Currents
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7 The Field Between Two wires
_1244471583.unknown
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10-2.3 Amperes LawComparing Gauss law and Amperes lawAmperes law
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The Magnetic Field Outside a Long Straight Wire with Current
EMBED Equation.2
_1244476641.unknown
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The Magnetic Field Inside a Long Straight Wire with Current
EMBED Equation.2
_1244476719.unknown
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7 A hollow conducting cylinder
EMBED Equation.2
_987890734.unknown
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10-2.4 Solenoids and ToroidsMagnetic Field of a Solenoid ()Magnetic Field of a Toroid ()
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Magnetic Field of a Solenoid
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Magnetic Field of a Toroid
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Tokamak Fusion Test Reactor
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10-2.5 A Current Carrying Coil and a Magnetic DipoleA current loop and a bar magnet
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Magnetic Field of a Coil
EMBED Equation.2
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1
_1244478975.unknown
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IV