Phys._219_Lec.08._2012.

Phys._219_Lec.08._2012. - Lecture 8-1 Charging a Capacitor...

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Lecture 8 Lecture 8 -1 Charging a Capacitor in RC Circuits Δ V C Δ V R ε 1. Charging equation: From Kirchhoff's Law // 0 0 tRC t q iR i e I e CR τ −− −−= = = V across is . thus at 0 R R it R Δ == i + _ Q C q C i / t e 3. During charging: As C is charged more and more Δ V C across C increases. At the same time across R decrea . ses R V Δ 4. Fully charged: Current is zero, thus C V Δ= across is zero, thus 0 at R VR Δ = =∞ I 2. Switch closed at t = 0. Initially C is uncharged. ⇒Δ V C across C is initially zero. Discharging and charging
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Lecture 8 Lecture 8 -2 Behavior of Capacitors Charging Initially, the capacitor behaves like a wire because: After a long time, the capacitor behaves like an open switch , because: Discharging Initially, the capacitor behaves like a battery , because: After a long time, the capacitor behaves like an open switch , because: at 0 it R ε = = 0 at = =∞ at 0 VQ RRR C = == = at =
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Lecture 8 Lecture 8 -3 No single magnetic charge or stationary electric charge interaction with magnets or magnetic field has been observed. Interactions - among magnets, with N-S poles of the earth, with materials such as iron, nickel and with moving charges have been observed.
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Phys._219_Lec.08._2012. - Lecture 8-1 Charging a Capacitor...

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