... [D(d )tg d ]1 e 2rf (0 ) Trong ú: D( d ) - di chu k tia; f ( ) = D ( d ) ln V ( d ) ; f (0 ) = D ( d ) ln V ( d ) ; 17 f ' ( ) = ln V ( d ) C d sin ; d D ( d ) C sin d ln V ( ... 2 s C 2 U C 2 d U 2 aS aS b) kiu ỏp in Ri L (Bl ) m (Bl ) (Bl ) R (Bl ) S pcS (Bl ) paS c kiu in ng; 31 Ri L m d (n ) (n ) 2 (n ) rd (n ) d sd -L (n ) d aS aS d) kiu in t Hỡnh 2.4 - S in tng ... grad ( ) T phng trỡnh (1 .1.3) ta cú ng thc: p' = t ( 1.1.6 ) ( cng nh v sau, n gin, ta b ch s p0 v 0) Kt hp (1 .1.6) v (1 .1.5), ta cú: c = t (1 .1.7 ) ú: c= p p0 S (1 .1.8 ) Phng trỡnh (1 .1.7)...