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Unformatted text preview: B field of current element (sec. 28.2) B field of currentcarrying wire (sec. 28.3) Force between conductors (sec. 28.4) B field of circular current loop (sec. 28.5) Ampere’s Law (sec. 28.6) Applications of Ampere’s Law (sec. 28.7) C 2009 J. Becker Source of Magnetic Field Ch. 28 Learning Goals we will learn: Ch 28 • How to calculate the magnetic field produced by a long straight current carrying wire. • How to calculate the magnetic field produced by a circular currentcarrying loop of wire. • How to use Ampere’s Law to calculate the magnetic field caused by symmetric current distributions. (a) Magnetic field caused by current element d l. (Similar to B field lines caused by a moving charge +q.) (b) Here the current is moving into the screen. Magnetic field produced by a straight currentcarrying wire of length 2a. The direction of B at point P is into the screen. x o Law of Biot and Savar t dB = o / 4 (I d L x r ) / r 3 Magnetic field around a long, straight conductor. The field lines are circles, with directions determined by the r ighthand r ule . Parallel conductors carrying currents in the same...
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This note was uploaded on 01/15/2010 for the course PHYS 051 at San Jose State.
 '09
 JBecker
 Physics

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