Physics 240: Capacitance and Capacitors - Discussion Notes and Class Agenda - Prof. Andrew, Study notes of Physics

Download Physics 240: Capacitance and Capacitors - Discussion Notes and Class Agenda - Prof. Andrew and more Study notes Physics in PDF only on Docsity! Discussion Notes and Class Agenda Physics 240 February 1, 2006 Problem Assignments Problem Groups 24.14 1, 3 24.62 5, 7 24.66 2, 4 24.12 6, 8 Discussion: Capacitance and Capacitors Having established a good understanding of charge, electric fields, and electrostatic potential, we now turn to the practical application of what we have learned by studying our first electronic component: the capacitor. We have seen that many objects can store charge, and that we can relate the charge stored to the potential applied Q CV The proportionality constant C is called the capacitance of the object, and depends only on the geometry of the object or device which stores the charge. The capacitance has units of ε0×(length). This is useful for length). This is useful for roughly estimating the capacitance of objects. Example: Stray Capacitance Since ε0=8.85 ×10-12 C2/N-m2, we see immediately that objects 0.1 meter (length). This is useful for 10 cm) in size will have capacitances of order 10-12 Farad = 1 pF. The