Chapter_24 - Chapter 24 Capacitance and Dielectrics...

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Chapter 24 Capacitance and Dielectrics Responsible for sections 1-4
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Capacitors: store energy and act like “springs” in electronic circuits Two conductors any shape + + + + Conducting path (wire) for flow of charge high electric potential low electric potential symbol
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Define capacitance +Q Q V a V b Electric potential difference = V a V b V ab V ab = b a E dl = + a b E dl Electric field between plates Q implies: V ab =constant × Q constant = 1/capacitance
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More on capacitance • Capacitance C (coulombs/volt) •C Q/V ab Memorize • Large capacitance implies you can put lots of charge on the plates and the electric potential difference (electric tension) between the plates is low. And vice versa. • Difficult to calculate capacitance for arbitrary conductors. Easy to measure capacitance.
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Capacitances of some capacitor geometries • Parallel plates (plate area = A, plate separation = d) C = A ε 0 /d • Concentric spheres (inner radius = r a , outer radius = r b ) C = 4
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Chapter_24 - Chapter 24 Capacitance and Dielectrics...

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