同济大学：《大学物理》课程教学资源（电子教案，英文版）第十二章 电场与电势（下）

Electric potential 100004DECIMILA 281 CAMP AA000000A BANCA DITAUA AA000000A

Electric potential

Agenda today electric potential equipotentials relationship between electric potential and field strength electric potential and electric field around conductor

Agenda today electric potential equipotentials relationship between electric potential and field strength electric potential and electric field around conductor

Work done by electric force: dA=q,E·dl=q,Ecos0dl E= 4πe,r2 a dA= 9o9 cos0 dl= 99 _dr 4π6，r1 4π6.1

Work done by electric force: q b a r  r   dr  dE   dA q E dl q E dl  o   o cos   2 4 r q E   o  dr r q q dl r q q dA o o o o 2 2 4 cos 4       

The work done by electric force is independent of the path taken by the charge,thus static electric force is conservative force. A=fq.E.dT=0

            o a b o r r o o a b r r q q dr r q q A b a 1 1 4 4 2     The work done by electric force is independent of the path taken by the charge, thus static electric force is conservative force.    0 l o A q E dl     0 l E dl  

Electric potential Electric potential energy Point charge q moves in static electric field with no other force exerted on the charge except the static electric force from a to b: △9==qE

Electric potential Electric potential energy Point charge q moves in static electric field with no other force exerted on the charge except the static electric force from a to b: