Lecture_8

Lecture_8 - Lecture 8-1 Charging a Capacitor in RC Circuits...

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Lecture 8-1 Charging a Capacitor in RC Circuits I 1. Switch closed at t=0. Initially C is uncharged. => V C across C is initially zero. V R across R is . 2. During charging: As C is charged more, V C across C increases. V R across R decreases. 3. Fully charged: Current is zero. So V C = . V R across R is zero. V C V R
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Lecture 8-2 Behavior of Capacitors Charging Initially, the capacitor behaves like a wire . After a long time, the capacitor behaves like an open switch . Discharging Initially, the capacitor behaves like a battery . After a long time, the capacitor behaves like an open switch
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Lecture 8-3 No net charge – no interactions with stationary charges Interactions - among themselves, with N-S poles of the earth, with materials such as iron, nickle, tapes, disks, … and with moving charges Magnetism Permanent magnets: rocks from Magnesia, compass needle, bar magnet, … magnetism action at distance like E Define B by interaction with a moving charge q magnetic field
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Lecture 8-4
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Lecture_8 - Lecture 8-1 Charging a Capacitor in RC Circuits...

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