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Unformatted text preview: Univ. of Ontario Institute of Technology Faculty of Engineering and Applied Science ' & Magnetic Fields • An electric current produces a field around itself which exerts force on any other current in the field. This field is called Magnetic field. • To quantify a magnetic field two quantities are used: – magnetic flux, Φ in webers ( W ), – and magnetic flux density B in webers per square meter ( Wb / m 2 ) or teslas . Electric Circuits (ENGR2790U) 289 of 310 Magnetic Fields ' & • Magnetic fields are usually represented by means of lines of force. The density of these lines in space is used to visualize the strength of the field. Electric Circuits (ENGR2790U) 290 of 310 Magnetic Fields ' & • A magnetic filed exert force on a moving charge. The amount of force is f = quB sin θ where q is the amount of charge, u is charge velocity, and θ is the angle between the moving direction of the charge and the magnetic filed. • The direction of the force is determined by righthand rule. Electric Circuits (ENGR2790U) 291 of 310 Magnetic Fields ' & • It has been observed that a current flowing through a conductor exerts force on moving charges (i.e. another current) in the same a magnetic field of a magnet does. • This is the socalled Ampere’s law. Electric Circuits (ENGR2790U) 292 of 310 Univ. of Ontario Institute of Technology Faculty of Engineering and Applied Science ' & Faraday’s Law • Relationship between φ and B is given by φ = Z A BdA • Faraday’s law states that if the magnetic flux passing through a closed conductor is changed, an electric voltage is induced in the conductor. This induced voltage produces a current in the conductor....
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 Spring '10
 dhavidhe
 Magnetic Field, Faculty of Engineering and Applied Science, Univ. of Ontario Institute of Technology

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