4.真空电磁波方程 VD=p, 电磁学的麦克斯韦方程(微分形式) V×E V·B=0 真空时:=0.7=0A,D=6EVx厅=7+D E=0 V×Hn=E0Em V×E V×E t 2 V×H V×V×E E.=0 01t V×(A×B)=(B.V)A-B(V.A)+A(V.B)-(AV)B A→VB→EVx(×E)=(EV-E(VV)+V(VE)-(V)E=-(VV)E E-a(vV)E=o H=04. 真空电磁波方程 电磁学的麦克斯韦方程(微分形式) t t H j D B E B D = + = = − = 0, , , 真空时: j B H D E 0 0 = 0, = 0, = , = t t H E H E H E 0 0 0, , 0, = = = − = Ht Ett = 0 E + 0 0 Ett = 0 , E 0 Ht = − A B B A B A A B A B ( ) = ( ) − ( ) + ( ) − ( ) E E E E E E ( ) = ( ) − () + ( ) − () = −() ( ) 0 2 Ett −a E = ( ) 0 2 Htt −a H = A B E → , →