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# lect6_handout - Physics 208 Lecture 6 Todays Topics...

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1 Physics 208, Lecture 6 Today’s Topics ± Capacitance (Ch. 26.1-3) ± Capacitors and Capacitance ± Calculating Capacitance for parallel-plate, cylindrical, spherical capacitors. ± Combinations of capacitors ± Hope you have previewed! ² Find the potential difference between the two large conductor plates of area A and separation d ¾ Answer Exercise: Parallel Plates +Q ++++++++++++++ ----------------------- Q d E= 0 E= 0 E= σ/ε 0 See board Δ V= Qd/( ε 0 A) Note: Δ V is proportional to Q Realistic case E= 0 E= 0 -Q Capacitors ² A generic capacitor: two conductors oppositely charged ² Capacitor are very useful devices: ³ Timing control, noise filters, energy buffer, frequency generator/selector/filter, sensors, memories. .. Δ V Q Demo: Charging A Pair of Parallel Conductors Uncharged Charging flow of e - Δ V=V + -V -

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2 Capacitance ± Δ V Q Æ Q= C Δ V Æ C is called capacitance ± C= Q/ Δ V: amount of charge per unit of potential diff. ¾ Unit: Farad (F) = 1 Coulomb/Volt ¾ Parallel-plate: C= ε 0 A/d ¾ Cylindrical and Spherical: see examples in text ² Cylindrical: ²
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lect6_handout - Physics 208 Lecture 6 Todays Topics...

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