dau doan mach g o m di^n tro thuan R, cupn cam thuan c6 dp t y cam - H va
n
tu di?n mac noi tiep. K h i co = coo thi cuang dp dong di|n h i ^ u d y n g qua
doan mach dat gia t r i eye dai Im. Khicoj =100nrad/s hoaccoj =807rrad/s thi cuong do d o n g d i ^ n eye dai qua doan mach bang nhau va bang Im. Gia
tri cua R bang
A. 150Q. B . 2 0 Q . C . 6 0 Q . D . 5 0 Q .
^hdn tich vd huong ddn gidi
(0 thay doi, cuong dp dong dien khong doi nen ta c6 h$ thuc (***)
C0jC02 =
LC
K h i tan so coo mach cong h u o n g nen: L U R Theo bai ra:
C^ 2R2 =R2 + ( Z L I - Z L2 ) ' = > R = Z L I - Z L2
UN/2 u
L = 1007t-807i.- = 60n 71 71
C h p n dap an C
:au 2: Cho mach RLC noi tiep, Dat vao hai dau doan mach m p t hi?u di?n
the xoay chieu on d i n h c6 tan so f = 50Hz. D i ^ n d u n g cua t u d i # n C = i ^ F •
1 3
K h i L = L j = — H va L = L2 = — H thi h i f u di^n the 6 hai dau cupn day c6
7t 7t
gia t r i hi?u d u n g n h u nhau. D p t y cam L de U L max la A . A H 271 B i n n C i - H 371 D . - I H ~ 471
i'hdn tich vd huang d&n gidi
Khi CO hai gia t n L = Li hoac L = L2 cho ciing gia trj U L thi gia t n cua L lam cho U: m.ix khi:
Z L + Z 1 -^L2
« „ L = i ^ i^ ^ ^ l ^ => L = = = f (H)
Chpn dap an A