Lecture 25b - Capacitors(contd Discussion of Exam 1 Capacitors in parallel Have the same potential difference V across their plates Net charge q =

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Capacitors (contd.) Discussion of Exam 1
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Capacitors in parallel Have the same potential difference V across their plates Net charge q = q1 + q2 + q3 Equivalent capacitance Think about them like one giant capacitor with the area of 1 2 and 3 together. (Work out on board)
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Capacitors in series Have the same charge q on their plates Net voltage V = V 1 + V 2 + V 3 Equivalent capacitance eq 1 2 3 1 1 1 1 C C C C + Examples (Work out on board)
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Capacitor with dielectric Dipoles align so as to reduce the E field between the plates E 0
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5 One parameter – k (Kappa) the dielectric constant – can describe the modifications. Easy rule … Everywhere there is an e 0 , change it to e ke 0 . d A d A C 0 0 ke e Dielectric material increases the capacitance! air CC k Material Dielectric constant Breakdown E Field (MV/m) = dielectric strength Air ° = 1.00054 3 Paper ° = 3.5 16 Tantalum Oxide ° = 26 500 Water ° = 80 depends on purity
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This note was uploaded on 02/05/2011 for the course PHYS 220B taught by Professor Preminger during the Fall '10 term at CSU Northridge.

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Lecture 25b - Capacitors(contd Discussion of Exam 1 Capacitors in parallel Have the same potential difference V across their plates Net charge q =

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