Lecture 16 mar6 preview - Lecture 16 Magnetic Fields...

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Unformatted text preview: Lecture 16 Magnetic Fields generated by Currents Good luck tonight! Sources of B field B fields exert forces on moving charges and currents (ch. 27) Oersted experiment makes it clear that current-carrying wires exert forces on compass needles Moving charges and currents generate B fields (ch.28) B generated by a moving charged particleread 28.1 B generated by currentsour primary focus for today Demos: Oersted/tangent galvanometer Biot-Savart law (circa 1820) ( of a current element) 2 2 4 sin 4 r r l Id B d r Idl dB in in = = B = B = I dl r (dB out) (dB in) = 4 x 10-7 Tm/A Integrate along wire path to get total contribution to B at point P P B d Field lines around current element (end/axial view) B for a finite straight wire segment ) sin (sin 4 cos 4 cos cos cos 4 2 1 2 2 2 1 2 1 2 + = = = -- x I B d x I B x xd I B x Idl P 1 2 For an wire, 1 and 2 go to 90...
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Lecture 16 mar6 preview - Lecture 16 Magnetic Fields...

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