同济大学：《大学物理》课程教学资源（电子教案，英文版）第十四章 直流电路

Capacitor and Dielectric -1000773510

Capacitor and Dielectric

Agenda today l.Capacitance(电容) 2.Combination of capacitor 2.Gauss's law in dielectrics(电介质） 3.Energy of electric field

Agenda today 1. Capacitance（电容） 2. Combination of capacitor 2. Gauss’s law in dielectrics （电介质） 3. Energy of electric field

Capacitor: A pair of conductors,whether separated by empty space or nonconducting material,forms a capacitor Capacitor is a useful device to store energy and charge Capacitance:(电容) The constant that is the charge on either plate of the capacitor divided by potential difference of two plates 1F=1C/V AU

Capacitor: A pair of conductors, whether separated by empty space or nonconducting material , forms a capacitor Capacitance:（电容） The constant that is the charge on either plate of the capacitor divided by potential difference of two plates Capacitor is a useful device to store energy and charge 1F=1C/V

The parallel plate Capacitor(平行板电容器 E= E 0 U,-Un=[E.di-Ed-9d S A Capacitance: U

The parallel plate Capacitor(平行板电容器) -Q d + + + + + - - - - - A B +Q E S d S U U q C o A B    Capacitance: 

The cylindrical Capacitor(柱形电容器) By Gauss's law: E 2m8,rl s-E-2 qdr △U= R 2πE R capacitance C=. 2π61 △U In Rg/Ra

The cylindrical Capacitor（柱形电容器） l RA By Gauss’s law： RB A B o R R l q U ln 2    h r B A o R R l U q C ln 2    capacitance 