文档介绍：2014/6/17
一、 Choice Problems 2、Asshowninthefigure,auniformlycharged"infinite"
、
1 Auniformlychargedsphericalvolumeand cylindricalsurfacewithradiusa,linearchargedensityis l ,
asphericalshellisinvacuum,withequal insideathinwalledcoaxialcylindricalshellofradiusb,the
，
radiusandcharges thentherelation cylinderoriginallyunchargedbutconnectedtotheground.
betweentheelectrostaticenergyofthemis
(A) 均匀带电球体产生电场的静电能等于均匀 surfacewithdistancerfromtheaxis,EandtheUofPis
带电球面产生电场的静电能 l a
. (A) E=0，U= ln
2pe r a r P
(B) 均匀带电球体产生电场的静电能大于均匀 0 ·
l b b l
带电球面产生电场的静电能. (B) E=0，U= ln .
2pe a
均匀带电球体产生电场的静电能小于均匀 0