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Published byBenjamin Powell Modified over 9 years ago
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Announcements Homework for tomorrow… Ch. 29: Probs. 20, 22, & 54 CQ5: accelerates right CQ6: a) V a >V b b) ΔV ab <ΔV cd <ΔV ef c) yes, no 29.8: 1.5 V 29.12: E x (0cm<x<2cm) = +2,500 V/mE x (2cm<x<3cm) = -10,000 V/m 29.15: a) 27 V/mb) 3.7 V/m Office hours… MW 12:30-1:30 pm TR 9-10 am F 1-2 pm Tutorial Learning Center (TLC) hours: MW 8-10 am, 12-6 pmR 8-12 pm, 2-6 pm T 8-1 pm, 2-6 pmF 8-10 am, 2-5 pm
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Chapter 29 Potential & Field (Combinations of Capacitors)
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Kirchoff’s Loop Rule… Conductors in Electrostatic Equilibrium… Capacitance… Review…
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Any two electrodes, regardless of their shape, form a capacitor. The capacitance of two electrodes is.. and depends only on the geometry of the electrodes. Forming a Capacitor…
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The spacing between the plates of a 1.0 μF capacitor is 0.050 mm a. What is the surface area of the plates? b. How much charge is on the plates if this capacitor is attached to a 1.5 V battery? i.e. 29.6: Charging a capacitor
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Consider two capacitors in parallel… Can we find an equivalent capacitor, C eq, to the two capacitors, C 1 & C 2 ? Combinations of Capacitors + - C1C1 C2C2 + - C eq
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Consider two capacitors in parallel… Can we find an equivalent capacitor, C eq, to the two capacitors, C 1 & C 2 ? YES! Combinations of Capacitors + - C1C1 C2C2 + - C eq
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What about for several capacitors in parallel? Can we find an equivalent capacitor, C eq, to the capacitors, C 1, C 2, … (all in parallel)? Combinations of Capacitors + - C1C1 C2C2 + - C eq C3C3
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What about for several capacitors in parallel? Can we find an equivalent capacitor, C eq, to the capacitors, C 1, C 2, … (all in parallel)? YES! Combinations of Capacitors + - C1C1 C2C2 + - C eq C3C3
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Consider two capacitors in series… Can we find an equivalent capacitor, C eq, to the two capacitors, C 1 & C 2 ? Combinations of Capacitors + - C1C1 C2C2 + - C eq
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Consider two capacitors in series… Can we find an equivalent capacitor, C eq, to the two capacitors, C 1 & C 2 ? YES! Combinations of Capacitors + - C1C1 C2C2 + - C eq
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What about several capacitors in series? Can we find an equivalent capacitor, C eq, to the capacitors, C 1, C 2,… (all in series)? Combinations of Capacitors + - C1C1 C2C2 + - C eq C3C3
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What about several capacitors in series? Can we find an equivalent capacitor, C eq, to the capacitors, C 1, C 2,… (all in series)? YES! Combinations of Capacitors + - C1C1 C2C2 + - C eq C3C3
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The equivalent capacitance is 1. 9 F. 2. 6 F. 3. 3 F. 4. 2 F. 5. 1/2 F. Quiz Question 1
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Find the charge on and the potential difference across each of the three capacitors in the figure below. Given: E = 12 V, C 1 = 3 μF, C 2 = 5 μF, C 3 = 1 μF i.e. 29.7: A Capacitor Circuit + - C1C1 C2C2 C3C3
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