TlLiNSVERSE MOTION OF ELECTRONS 629 



and we obtain 



"'^IWTP)'" (13.55) 



If we have a very large magnetic field (/- » | 5- 1), then 



d8 = ^^da (13.57) 



and the change in 5 is purely reactive. If / = (no magnetic field), from 

 (13.55) 



d8 =^- da' (13.58) 



Adding a transverse field component increases the magnitude of 5 without 

 changing the phase angle. 



