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Phys 0175 - Lecture 13

Phys 0175 - Lecture 13 - Reminder Homework Assignments PHYS...

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Reminder: Homework Assignments: PHYS 0175 – LON-CAPA HW #04 Now Open: Due on Sunday(@10pm), February 8th
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Lecture 13 (Feb. 04, 2009): Chapter 25: Capacitance (cont’d) Combinations of capacitors: Several illustrative examples Energy stored in a capacitor Electric field energy
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3 Capacitors in parallel : 1 2 3 eq C C C C = + + V 1 = V 2 = V 3 = V 1 1 2 2 3 3 1 2 3 ; ; eq q CV q C V q C V q q q q C V = = = = + + = 3 Capacitors in series : V=V 1 +V 2 +V 3 = q/C 1 +q/C 2 +q/C 3 =q/C eq q 1 = q 2 = q 3 = q 1 2 3 1 1 1 1 eq C C C C = + +
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Example 13.1: (a) What is the equivalent capacitance of this combination of capacitors? Take C 1 =4.00 μF, C 2 =6.00 μF, and C 3 = 12.0 μF. (b) If V ab = +28.0 V, calculate the charge on each capacitor and the potential difference across each capacitor.
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Example 13.2: A 24.0 V battery is connected across this array of capacitors; their capacitances are C 1 =2.00μF, C 2 =3.00μF, C 3 =4.00μF, C 4 =5.00μF, and C 5 =3.00μF, and C 6 =4.00μF. (a) What is the equivalent capacitance of this array? (b) How much total charge is stored in this array?
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