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Transcript
Magnetic domains Electric and magnetic constants In the equations describing electric and magnetic fields and their propagation, three constants are normally used: • the speed of light c • The electric permittivity of free space ε0 • the magnetic permeability of free space, μ0, taken to have the exact value Contains the force unit N for Newton and the unit A is the Ampere, the unit of electric current. With the magnetic permeability established, the electric permittivity takes the value given by the relationship Give a value of free space permittivity In practice used in the form Expressions contain the units F for Farad, the unit of capacitance, and C for Coulomb, the unit of electric charge. Maxwell’s Equations James Clerk Maxwell (1831–1879) • One of the most concise ways to state the fundamentals of electricity and magnetism. • From them one can develop most of the working relationships in the field. • Form basis of Special Relativity, which requires that they hold in every frame of reference. Maxwell’s equations (integral form) Maxwell’s equations (differential form)
