Exam 2 Capacitors Properties o Positive and negative bodies are both conductors which implies that positive and negative potential are constant over respective conductor o Electric field E lines emerge from positive and disappear into negative conductor move from positive to the negative o Positive potential on conductor with charge q is greater than the negative potential on conductor with charge q assuming you define V final at any arbitrary point it will happen in the exact center equidistant from parallel and opposite plates Capacitance for cylinders o Energy stored in a capacitor o o Energy density in a capacitor Example one conducting sphere inside another spherical capacitor o o Dielectrics Note the charges on a dielectric are bound Conduction Current density j o o However if current is uniformly distributed o If current is not uniformly distributed Drift velocity o o Resistivity Power dissipated in a simple circuit just a resistor o o Electro motive force Internal resistance o o o Kirchloff s Laws o 1 Net current entering a junction equals net current leaving Charge conservation Junction a point where three or more conductors meet o 2 Signed sum of potential changes around a loop of circuit is zero Conventions Voltage source traversed From negative to positive Delta V emf From positive to negative Delta V emf Example o o o o Substitute some more then you get that I2 5 Amps and I3 1 Amps therefore the direction of I3 is the opposite that we guessed o From these we know that I4 4 Amps and I5 7 Amps o R equivalent V I 13 11 1 2 Ohms Resistor Capacitor Charging a capacitor Discharging a capacitor o o o o Exam 3 Magnetic Field
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