Lecture_16-1

Lecture_16-1 - Chapter 19 Capacitors, Resistors and...

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Chapter 19 Capacitors, Resistors and Batteries
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Capacitor: Charging and Discharging Experiment 1 Experiment 2
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The capacitor in your set is similar to a large two-disk capacitor s D Capacitor: Construction and Symbols There is no connecting path through a capacitor
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Capacitor: Discharge Electron current
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Capacitor Discharge The fringe field of the capacitor plus the electric field of the charges on the surface of the wires drive current in a way to REDUCE the charge of the capacitor plates. Recall that we derived an expression for the fringe field by considering the superposition of two charged disks separated by a distance s .
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Positive and negative charges are attracted to each other: how can they leave the plates? Fringe field is not zero! How is Discharging Possible? E Electrons in the wire near the negative plate feel a force that moves them away from the negative plate. Electrons near the positive plate are attracted towards it.
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E =0 in a wire – static equilibrium. Fringe field opposes the flow of current! Capacitor: Charging
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Lecture_16-1 - Chapter 19 Capacitors, Resistors and...

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