6.5. A cylindrical beam of electrons has radius a, a charge density po(1 - ra) (po

6.5. A cylindrical of electrons has radius a, a &nsity rla) < O) in the stationary frame, and velity v (S Fig. 6PS.) 6P.s 319 (a) Using the law for Chaz. &nsity, find the eletric and rnagwtic in a refererxe franr that is at rt with the ekctrons. (b) Without using any transformation hws, find trr electric and magnetic fields in stationary franr. (c) Show that (a) and (b) are consistent with the electric system transformation laws for E, H, and Jr.