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lecture10 - Physics for Scientists Engineers 2 Chapter 24 1...

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September 20, 2011 Physics for Scientists & Engineers 2, Chapter 24 1
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September 20, 2011 Physics for Scientists & Engineers 2, Chapter 24 2 Capacitors are devices that store energy in an electric eld Capacitors are used in many every-day applications Heart de brillators Camera ash units Touch screens Capacitors are an essential part of electronics Capacitors can be micro-sized on computer chips or super-sized for high power circuits such as FM radio transmitters and exist in a variety of shapes
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September 20, 2011 Physics for Scientists & Engineers 2, Chapter 24 3 A capacitor consists of two separated conductors, usually called plates, even if these conductors are not simple planes If we take apart a typical capacitor, we might nd two sheets of metal foil separated by an insulating layer of Mylar e sandwiched layers can be rolled up with another insulating layer into a compact form that does not look like parallel sheets of metal
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Assume a convenient geometry and then generalize the results e geometry we choose is a parallel plate capacitor , which consists of two parallel conducting plates, each with area A , separated by a distance d , in a vacuum e capacitor is charged by placing a charge of + q on one plate and – q on the other plate e electric potential, Δ V , between the plates is proportional to the amount of charge on the plates September 20, 2011 Physics for Scientists & Engineers 2, Chapter 24 4
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We can take a slice through the x - y plane e equipotential lines are close together between the plates and far apart outside the plates September 20, 2011 Physics for Scientists & Engineers 2, Chapter 24 5
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e potential di ff erence between the two plates is
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