Vx「Esin(k,F-my)v(k-)×osn(k,F-0 k.-er ak·F ik.Eet dEe V×Ee v(k,)× k·F i×E 14 ∫4)dr=」jv((r)r=J4s(r)) =d4s(()=「4(示 0 例:磁偶极距 在远场条件下r>>r'因此 ()=ar+∫rdr AG)=均∫ar=Jja: j(r dr’j(r)=0 A(G)=均∫PFr 4丌 (F)r·r'dr rF=rr'sinecos,J()=Joee dr'=r'do'( ) ( ) ( ) ( ) 0 0 0 sin sin cos E k r t E k r t k r k r k E k r t      −    − =          =   − ( ) ( ) ( ) ( ) 0 0 0 i k r t i k r t i k r t E e E e k r k r ik E e     −  −  −     =         =  ( ) ( ) ( ) ( )0 0 0 i k r t i k r t i k r t E e E e k r k r ik E e     −  −  −    =          =  1.4 ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) 0 V V S S S A r d A r r d dS A r r dSn A r r dS n A r r   =  =  =  =  =      例：磁偶极距 0 ( ) ( ) 4 j r A r d r     =   在远场条件下 r r  ' 因此 3 1 1 1 ' ' r r R r r r r =  + − 0 0 3 ( ) ( ) ( ) ' 4 4 j r j r A r d r r d r r         = +      0 0 0 0 ( ) ( ) ( ) 4 4 ( ) 0 ( ) 0 4 j r A r d d j r r r n j r d j r r          = =    = = =      0 1 3 0 3 ( ) ( ) ' 4 ( ) ' 4 j r A r r r d r j r r r d r       =   =      0 ' r r rr j r j e ' 'sin cos ', ( ') ˆ     = = d r d   ' ' ' = B v q a m