Lec2008_05 - Magnetism and electromagnetism Lecture 5...

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Unformatted text preview: Magnetism and electromagnetism Lecture 5 Lecture 5-1 Electronics and Laboratory Electronics and Laboratory Magnetic field agnetic fields are described by drawing flux lines that represent the • Magnetic fields are described by drawing flux lines that represent the magnetic field. • Magnetic fields are composed of invisible lines of force that radiate from the north pole to the south pole of a magnetic material. Where lines are close together, the flux density is higher. Where lines are further apart, the flux density is lower. Lecture 5 Lecture 5-2 Electronics and Laboratory Electronics and Laboratory Magnetization • Magnetic field lines are always associated with moving charge. • In permanent magnets, the moving charge is due to e orbital motion of electrons Ferromagnetic the orbital motion of electrons. Ferromagnetic materials have minute magnetic domains in their structure. • In ferromagnetic materials such as iron, nickel, and cobalt, the magnetic domains are randomly oriented when unmagnetized. When placed in a magnetic field, the domains become aligned, thus they effectively become magnets. Lecture 5 Lecture 5-3 Electronics and Laboratory Electronics and Laboratory Magnetic quantities agnetic flux( he group of force lines from the north pole to the south • Magnetic flux( φ ): The group of force lines from the north pole to the south pole of magnet • Magnetic flux density (B): the amount of flux per unit area perpendicular to the magnetic field • The unit of flux is the weber. The unit of flux density is the weber/square meter, which defines the unit tesla, (T), a very large unit. Flux density is given by the equation l li ( ) where B = flux density (T) Flux lines ( ϕ) Area (m ) 2 ϕ = flux (Wb) A = area (m 2 ) B = ϕ A • The unit G (gauss) from CGS (centimeter- gram-second) system Lecture 5 Lecture 5-4 Electronics and Laboratory Electronics and Laboratory 10 4 gauss = 1 T Electromagnetism • Electromagnetism is the production of a magnetic field by current in a conductor....
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Lec2008_05 - Magnetism and electromagnetism Lecture 5...

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