Ch. 26 Capacitance HW 26 (8E, 26P, 38E, 62P) Due on Oct. 4, ) Capacitance 26-3) Calculating the Capacitance o Parallel-Plate Capacitor 26-3) Cylindrical Capacitor L

o Spherical Capacitor cf) if b-> , Isolated sphere, letting a=k then 26-4) Capacitor in Parallel and in Series ; 모든 Capacitor 의 양단에 걸린 전위차는 V 로 일정. CnCn.... -qn-qn +qn+qn =

o Series 26-5) Storing Energy in an Electric Field o The work done by on external agent(battery)  Storing :(Electric potential Energy) VnVn CnCn =

o Energy density : u: potential energy per unit volume cf) parallel plate capacitor 26-6) Capacitor with a dielectric o free space +q+q o space completely filled by a dielectric material. +q+q o Fig (a) V: constant 즉 V=E 0 d-->E 0 d/  로 바뀜, 그런데 V 가 일정하므로 E 0 d = E 0 d/  즉, E 1 =  E 0, 따라서 유전체를 삽입하면 E 가 증가해야 하므로 q 가 증가 (b) q : constant

26-7) Dielectric : An atomic View 26-8) Dielectric and Gauss’ law Total dis. Ext. Field Polariz. field : electric displacement Dielectric molecules :neutral Polarize sets up E’ E 0 : applied field E : resultant field inside the dielectrics =E 0 / 

Region 1) Region 2) Region 3) *** 주의 : 파워 포인트 Version 의 충돌로 인하여 Vector(‘->’) 표시가 ‘  ’ 표시로 보일 수도 있습니다.