From: ram@zedat.fu-berlin.de   
      
   Kuan Peng  wrote or quoted:   
   >You think the current to be "alternating", I think it to be direct,   
   >although increasing current.   
      
     Maxwell's equations hold in any case.   
      
   >Is electron beam an electric current?   
      
     Yes. The current is the charge per unit time passing a given point.   
     Negative charges count as positive charges in the opposite direction.   
      
   >                                      Do we use Maxwell’s equations to   
   >describe its behavior?   
      
     The behavior (acceleration) of each electron is given by   
     Newton's second law, F=ma, where F = F_em + F_other, and the   
     electromagnetic force F_em = Q[E + (v x B)] (when radiation   
     reaction [the recoil due to the electron's own electromagnetic   
     radiation] is negligible, which it usually is).   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)