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Lecture 18 preview mar13 - Lecture 18(chapter 29 Faraday's...

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Lecture 18 (chapter 29) Faraday’s Law of Electromagnetic Induction (Maxwell’s 3 rd equation) WARNING: Deeply meaningful and mathematically explicit equations will be displayed in this and following lectures. Side effects may include palpitations, fainting, dizziness, rational exuberance, and a deep-seated sense of natural enlightenment. If symptoms persist, remove student to a well ventilated accounting course.
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Moving electric charges (electric currents) generate B fields Can moving magnets (magnetic currents) generate E fields? Our DEMO with magnet and coil indicates YES! No monopoles
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Experiments with conductors moving in B fields and changing B fields 1. Conductors moving across (cutting) B field lines 2. Magnet moving relative to conducting coil and visa versa Demos Consider the magnetic force on the free conduction charges in a wire that is pulled through the field………………..
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Motional EMF vBL EL V V V B v E hence B v q E q F bot top net = = = - = × - = × + = = ξ 0 If we complete the circuit so the bar slides on conducting rails we get a current flowing upwards in the bar. We can’t just pull the rigid loop through the field (no current) I So what if there is no relative motion of a conductor cutting through B field lines???
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