Electromagnetisme
Electric Fields Coulombs law: Electric potential: Gauss theorem:
Stokes theorem: Line integral: Gauss theorem:
V Capacitor with dielectric d Field without dielectric: With dielectric we get polarization P in the material: D-feltet indføres som: For simple dielectrics (type 1: Electric susceptibility Electric permittivity -----” of vacuum Material parameters
Capacitor with dielectric V 0
Magnetic fields Lorentz Force on particles: or in fluids: Find charges and currentsCalculate fields: E and B Calculate forces Magnetic field strenghMagnetic flux density permeabilty Vacuum field
Calculate magnetic fields Biot and Savarts law: Amperes law Plasma physics: Include all currents and use μ 0 : Magnetic materials: From currents find the H-field From material find B=B(H,t)
Maxwells ligninger Faradays lov Amperes lov - Poissons ligning Lorentzkraft
Plasma frequency
Plasma oscillations