Chuong III.thuvienvatly.com.7571c.36715

8/13/2019 Chuong III.thuvienvatly.com.7571c.36715

1/28


2/28

. N '( *- '( %+4' ,- ,7$'( 8 !" # $ %&'( *+ ,- / '(.

" ;ng lng in trng t3 p trung tu in.

( ).co!--

2 --'

-

+== t C

qC q

' %

" ;ng lng t trng t3 p trung cun cam.

( ) ( ).!in-!in

-2

-2 -

-'--

'-- +=+== t C qt q L Li' t

" ;ng lng in t trong mach dao ng l tng nng lng in trng v nng lng t trngcua mach.

.-2

--'

-' c$nst L( C

q' ' ' t % ===+=

N"2' => ,: ;ng lng trong mach dao ng gm nng lng in trng t3 p trung tu in v nng

lng t trng t3 p trung cun cam. >?ch dao @ng cA tBn ! gAc: tBn ! D vE chu kF G thH nng lIng iJn trKng v nng lng

t trng! '( bi n thin tu3n hon vMi tBn ! gAc -: tBn ! -D vE chu kF-T .

Gai moi thi im: tng nng lng in trng v nng lng t trng lun lun khng i. ; i cch khc: nng lng in t trng cua mach dao ng lun bao ton.

;ng lng in trng cc ai & nng lng t trng cc ai & nng lng in t trng.

.-2

--'

-'

mama L(

C q

' ' ' t % ==== (Lu < thm rng'

'

U q

C = +

J. N( ?4' '"2' , , #2' ! / # $ %&'( %+4' ,- ,7$'( 8 !" # $ %&'(.

" Ghc t: cun cam v d3< ni u c in tr (d nho+ lm tiu hao nng lng trong mach(di dang toa nhit th=o hiu ng Nun"l=n +." 7ng thi mt ph3n nng lng cua mach bi bc a ra khng gian ung %uanh di dang !ng

in t.

K. D $ %&'( %+4' ,- # ? ,7+.

" ;gu


3/28

" ; u in tr thu3n P cua mach r3t ln th ! chnh lch gi/a bin dao ng cng hngvi bin cua cc bin dao ng in t c/ng bc khc !=/ khng ln lm. # cnghng n< goi l ! cng hng t

II. IN T T NG @T NG IN TB

1. G+ / ," ?4 , ! / M ! =$>' 64 8& + < ' "4 (+- %+4' ,7- '( 6 ,- ,7- '(.

" Shi mt t trng bin thin th=o thi gian: n !inh ra mt in trng o


4/28

IV. S PHT V THU SNG V TUYN

1. S- E" , $ '( 6& , ?4 '.B N( ?4' , ! E" , $ '( 6& , ?4 '.

Qng cc !ng in t cao t3n. * ch ng mang nng lng ln. * phan a tt trn t3ng in li: mt 3t v mt nc: nn c th tru56: Z >56: 9 >56 ...

Vin iu !ng cao t3n.\m ngh= c c t3n ! t 2Z 56 n -' ''' 56. C n !ng cao t3n c t3n ! c/ >56: tai

ngi khng ngh= c.3 n l phai lm !ao cho !ng cao t3n tru


5/28

D '( 1 WI TO N VX T N S DAO RNG ING THU5 PH T SNG IZN T[ C\AM CH DAO RNG

GBn ! gAc: tBn ! vE chu kH dao @ng ring c]a m?ch LC$LC-GW

LC-

2D W

LC

2 =

==

CBn lu ^: C lE iJn dung c]a b@ t_ iJn.

* ; u b@ t_ g`m C2: C-: CT:... m c n i ti p: iJn dung c]a b@ t_ t nh b i ...C2

C2

C2

C2

T-2

+++= : khi

A

...TC

2C2

C2

L-GW...

TC2

C2

C2

L2

-2

D W...TC

2C2

C2

L2

-2

-2-2 +++=

+++=

+++=

* ; u b@ t_ g`m C2: C-: CT:... m c !ong !ong: iJn dung c]a b@ t_ lE C & C2 * C- * CT *...: khi A...+CCC(L-GW

...+CCC(L-

2D W

...+CCC(L

2T-2

T-2T-2

+++=+++

=+++

=

#Ang iJn t m?ch dao @ng LC phet hofc thu Ic cA tBn ! ng b ng tBn ! ring c]a m?ch: ta cAth ec jnh bMc !Ang c]a ch ng (v n t c tru< n !Ang trong khng kh cA th l < b ng c & T.2'Um4!+$LCc-cG ==

P"- '( E"]E1. > i gie trj c]a L hfc C: cho ta m@t gie trj tBn ! : chu kH tng ng: vi t t t c cec bi u th c tBn !hofc chu kH A r`i gen nhqng gie trj bEi cho tng ng (n u cA+.Q$Shi @ t c m cu@n d3< lE L2: iJn dung t_ iJn lE C2 thH chu kH dao @ng lE G2Shi @ t c m cu@n d3< lE L-: iJn dung t_ iJn lE C- thH chu kH dao @ng lE G-

Ga ph i vi t ra cec bi u th c chu kH tng ng$-22 CL-G =

--- CL-G =

#au A ec l p m i lin hJ toen hsc giqa cec bi u th c A. GhKng lE l p t ! W bHnh phng hai v r`ic@ng: tr cec bi u th cW phng phep th .

). G cng th c t nh bMc !Ang ta th : L> thH bMc !Angc ng bi n thin tng ng trong d i t mmm CLc- = n >>> CLc- =

^+ 1 ; u i u ch nh iJn dung c]a m@t m?ch dao @ng tng ln 9 lBn thH chu kH dao @ng rinc]a m?ch tha< i nh th nEo (@ t c m c]a cu@n d3< khng i+w

CA hai gie trj c]a iJn dung$ C vE Cx & 9C: tng ng vMi hai gie trj chu kHLC-G = vE

G-C.L--C9.L-yLC-yG ====< chu kH tng - lBn.

" Shi lEm bEi tr c nghiJm: khng ph i trHnh bE< vE ti t kiJm thKi gian: ta cA nh n jnh !au$ G bi u th c t nh chu kH ta th < G t lJ vMi cn b c hai c]a iJn dung C vE @ t c m L.

" G c lE: n u C tng (ha< gi m+ n lBn thH G tng (ha< gi m+n lBn: n u L tng (ha< gi m+ mlBn thH G tng (ha< gi m+m lBn. ;gIc l?i vMi tBn ! D.

;h bEi t p trn: do C tng 9 lBn: !u< ra nga< chu kH tng-9 = lBn.^+ ) ; u tng iJn dung c]a m@t m?ch dao @ng ln U lBn: `ng thKi gi m @ t c m c]a cu@n d3?ch iJn nAi trn cA th thu Ic !Ang cA bMc !Ang ' b ng bao nhiuw b+ 7 thu Ic d i !Ang t -'m n Y'm: ngKi ta ph i gh p thm m@t t_ oa< C vMi t_ C nAi

trn. 5i ph i gh p nh th nEo vE gie trj c]a C thu@c kho ng nEowa+ VMc !Ang m?ch thu Ic$ m-''2'.2'''.2'.T:222'.T.-LCc- 2-ZU' === b+ ;h n t$Q i !Ang cBn thu cA bMc !Ang nh hn bMc !Ang ' nn iJn dung c]a b@ t_ ph i nh hn C. Qo

A ph i gh p C n i ti p vMi C.

Shi A$---

-

LCc9

CC

CC

C.CLc-

=+=

Mi ': C bi n thin nghjch bi n th=o.

z2'.8:ZZ-'2'.2'.T:22.+2'.T(9

2'.2'''.-'LCc9

CC

z2'.2:2'Y'2'.2'.T:22.+2'.T(9

2'.2'''.Y'LCc9

CC

2--[Z-U-

2--

-min

--

-min

ma

2--[Z-U-

2--

-ma

--

-ma

min

===

===

< pz8:ZZC pz2:2' .

D '( ) C C GI T _ IZN T`CH5 HIZU IZN TH VW CaNG R DbNG IZN T ONGcU T dNH DAO RNGQ?ng bEi toen nE


9/28

;h v ?ch dao @ng LC cA cKng @ dng iJn c c ?i ,' & 2'm1: iJn t ch c c ?i c]a t_ iJn lEC2'.9 U'

= .a+ G nh tBn ! dao @ng trong m?ch. b+ G nh hJ ! t c m c]a cu@n d3?ch dao @ng LC l t ng dao @ng vMi chu kH ring G & 2'"9

!:

hiJu iJn th c c ?i giqa hai b n t_ 0 ' & 2' : cKng @ dng iJn c c ?i %ua cu@n d3< lE ,' & ':'-1. G nh iJn dung c]a t_ iJnvE hJ ! t c m c]a cu@n d3


10/28

G nh cec gie trj c c ?i c]a iJn t ch trn t_ iJn: hiJu iJn th hai Bu cu@n d3< vE cKng @ diJn %ua cu@n d3


11/28

b+ Shi nng lIng iJn trKng t_ iJn b ng nng lIng t trKng cu@n d3< thH iJn t ch trnt_ iJn b ng m < phBn trm ' w

GBn ! dao @ng$56Y'''

2'.

2'..-

2

LC-

2D

Z-=

=

=

Shi nng lIng iJn b ng nng lIng t

-

2

t

t ==+

=ha t mach dao ng LC gm cun thu3n cam c t cam L &

- 5 v mt tu in c in

dung C &

- z. Chu k dao ng cua mach l $

1. ':'9 !. . 9599 . C. ':'2 !. Q. ':''2 !.C2 F: Chon c3u tra li 70 ;. Grong mach dao ng LC: bin ph p du< tr dao ng l $

1. mc thm vo mach mt cun cam.V. mc thm vo mach mt tu in.C. dng m< pht dao ng iu ha dng tran6ito.Q. dng mach khch ai.

C2 : Chon c3u tra li 70 ;. Grong mach dao ng in t LC $1. in tch trn ban tu bin thin iu ha cng t3n !: cng pha vi cng dng in

trong mach.

1F


16/28

V. in tch trn ban tu bin thin iu ha cng t3n !: !m pha-

!o vi cng dng

in trong mach.

C. %+4' ,+ !" ,74' 3 / ' , 3+4' ,"+4' %+4 "$ ! '( ,2 ' & 5 ,74 E"-

$ 6 + !- '( %& #$'(

%+4' ,7$'( 8 !".Q. Ca 1: V: C u !ai.

C2 J: Grong mach dao ng LC: chu k dao ng cua mach c tnh th=o cng thc $

1. LC

T -= . V.C L

T -= . C. LC

T -

2= . D.'

'- ( q

T = .

C2 K: Grong mach dao ng LC: nng lng t trng (t3 p trung cun cam L+ thi im t ctnh th=o cng thc $

1.C

q' t -

-

= . .-

- Li' t = . C. C

u' t -

-

= . Q.-

-Cu' t = .

C2 : > t mach dao ng LC c cun thu3n cam c t cam L & ':- 5 v tu in c in dung C& 2' z. th i im t: hiu in th gi/a hai ban tu l Z . ;ng lng in trng gi/a hai ban tu thi im l $

A. 15K.19 j. V. 2:U.2'"T N. C. T:Z.2'"9 N. Q. T:Z.2'"T N.C2 19: Chon c3u tra li 70 ;.

1. ;ng l ng cua mach dao ng LC gm nng lng in trng t3 p trung tu C: nnglng t trng t3 p trung cun cam L.

V. ;ng lng in trng v nng lng t trng u bin thin tu3n hon cng t3n !.C. Gai m/i thi im: tng nng lng in trng v t trng lun khng i: tc l c

bao ton.D. C / A5 5 C %4 % '(.

C2 11: Grong mach dao ng LC: nng lng t trng trong cun cam L $1. bin thin tu3n hon th=o thi gian vi chu k -G.V. bin thin tu3n hon th=o thi gian vi chu k G.

C. 3+4' ,"+4' , 2 ' "$ ' ,">$ ," + (+ ' 6 + !" Q+ -

T .

Q. khng bin thin iu ha th=o thi gian.@ V$+ !" Q+ T )l LC B

C2 1): Chsn c3u tr lKi 7 ;.7a i lng no di 3< cua mt mach dao ng thc (khng phai l tng+ c th coi l khng

i i vi thi gian w1. Vin . . T2 ' & # $ %&'( 7+4'(.C. ;ng lng dao ng. Q. Oha dao ng.

C2 10: > t mach dao ng LC c cun cam thu3n L & Y 5 v tu in c C & Y z. 5iu in th ccai gi/a hai ban tu l 2' . ;ng l ng dao ng cua mach l $

1. ':-Y N. V. -:Y.2'"T N. C. -:Y N. D. )5F.19 j.C2 1 : Grong mach dao ng LC: nng lng dao ng cua mach (nng lng in trng+ ctnh bi cng thc $

1. C q' -

-

'= . V. --

' L( ' = . C. --

'Uq' = . Q. --

'CU ' = .C2 1F: Chon c3u #1,. 7in trng v t trng trong mach dao ng LC bin thin tu3n hon $

1. cng t3n !. V. cung chu k.

1


17/28

C. cng bin . D. ! '( E" .C2 1 : > t mach dao ng LC c cun thu3n cam c t cam L v tu in c in dungC & -' z. 5i u in th cc ai gi/a hai ban tu l 2' . th i im t : hiu in th gi/a hai ban tul U . ;ng lng t trng gi/a hai ban tu thi im l $

1. T:Z.2'"T N. V. Z:9.2'"T N.C. 05 .19 j. Q. Z:9.2'"9 N.

C2 1J: 7c im no trong ! cc c im !au khng phai l c im chung cua !ng c hoc v!ng in t $

1. mang nng lng.V. l !ng ngang.C. bi nhi/u a khi g p v3t can.D. ,7 ?4 ' %- ! ,7$'( !"2' Q"&'(.

C2 1K: Grong mach dao ng LC: cng dng in %ua cun cam bin thin iu ha th=o thigian vi chu k$

1. -G . T

C.-

T . Q. Shng bin thin th=o thi gian.

C2 1 : Chon c3u tra li 70 ; khi ni v cc tnh ch3t cua !ng in t $A. T7 ?4' %- ! ,7$'( 8$ + 8&+ ,7-'( 62 , !"2 , Q4/ ! / !"2' Q"&'(.V. 3 n tc tru


18/28

C. L &C

q-

-' co!-)t vE c &

C q-

-' !in-)t. Q. L &

C q -' !in-)t vE c &

C q-

-'

co!-)t.C2 ) : Chsn c3u tr lKi 7 ;. >@t khung d3< dao @ng iJn t g`m m@t t_ iJn cA iJn dung CvE hai ng d3< cA hJ ! t c m L2 vE L-. Shi d~ng t_ m c ring biJt vMi t ng ng d3< thH tBn ! dao@ng c]a ng d3< lBn lIt lE D 2 & T' k56 vE D - & 9' k56. ; u d~ng t_ iJn C m c `ng thKi vMi hai

ng d3< thEnh m?ch'z+ ,+{E thH tBn ! dao @ng c]a m?ch lE $A. ) QH|. V. T' k56. C. 9' k56. Q. Y' k56.C2 )F: Chsn c3u tr lKi 7 ;. >@t m?ch dao @ng LC g`m cu@n thuBn c m cA @ t c m L & Z9'5 vE m@t t_ iJn cA iJn dung C bi n thin t TZ pz n --Y pz. L < - & 2'. Chu kH dao @ng ringc]a m?ch cA th bi n thin t $

A. 9 8 } ) 99 8 . V. [Z' ! -9'' !.C. [Z' n! -9'' n!. Q. [Z' p! -9'' p!.

C2 ) : Shi m@t iJn t ch i m dao @ng i u hoE !{ !inh ra $A. m'( %+g' ,i. V. !Ang !iu 3m.

C. !Ang c hsc. Q. !Ang 3m.C2 )J: Shi cho m@t dng iJn oa< chi u ch?< trong m@t d3< d|n thng b ng kim lo?i: ung %uanhd3< d|n !{ cA $

1. iJn trKng. V. t trKng.C. %+g' ,i ,7-o'(. Q. trKng h p d|n

C2 )K: Cho m@t cu@n d3< thuBn c m cA @ t c m L vE hai t_ iJn C2 vE C-. Shi m c cu@n d3< ringvMi t ng t_ C2 : C- thH chu kH dao @ng c]a m?ch tng ng lE G2 & T m! vE G- & 9 m!. Chu kH dao@ng c]a m?ch khi m c `ng thKi cu@n d3< vMi C2 !ong !ong C- lE $

A. F 8 . V. 8 m!. C. 2' m!. Q. 2- m!.

C2 ) : Chsn c3u tr lKi #1,. Qao @ng iJn t trong m?ch dao @ng l t ng cA nhqng t nh ch t!au $ 1. ;ng lIng c]a m?ch dao @ng g`m cA nng lIng iJn trKng t p trung t_ iJn vE nnglIng t trKng t p trung cu@n c m.

. S~ 3+{' ,"+4' %+g' ,w!" ,7$'( 8 !" # $ %'( !m !y'( ,h' z 6+ ' '( *-f'( ,n! ,"o+! ! ' !8 6^ , %+g'.

C. nng lIng iJn trKng vE nng lIng t trKng c ng bi n thin tuBn hoEn c~ng bin @.Q. G?i msi thKi i m: t ng c]a nng lIng iJn trKng vE nng lIng t trKng Ic b o

toEn.C2 09: Chon c3u tra li 70 ;. Grong mach dao ng LC nng lng in t trng cua mach dao

ng $1. bin thin iu ha th=o thi gian vi chu k -G.V. bin thin iu ha th=o thi gian vi chu k G.

C. bin thin iu ha th=o thi gian vi chu k -

T .

D. Q"&'( 3+4' ,"+4' ,">$ ," + (+ '.@,7$'( %$ T )l LC B.

C2 01: Chsn c3u tr lKi #1,. >t mach dao ng LC c cun cam thu3n c t cam L v tu inc in dung C. 5iu in th cc ai gi/a hai ban tu l 0 ' . ;ng lng dao ng cua mach l $

A. --'CU ' = . V. -

-' LU ' = . C. C U ' -

-'= . Q. LU ' -

-'=

.

1K


19/28

C2 0): Grong mach dao ng in t: nu in tch cc ai trn tu in l %' v cng dng incc ai trong mach l ,' : th t3n ! dao ng in t trong mach l $

1.'

'- ( q

f = . V.'

'

-2

( q

f

= .

C.'

'

-2

q (

f

= . Q. ''-2

q ( f

= .

C2 00: > t khung dao ng in t gm mt tu in c in dung C v hai ng d3< c h ! t camL2 v L- . Shi dng tu mc ring bit vi tng ng d3< th t3n ! dao ng cua ng d3< l3n lt l D 2 &T' k56 v D - & 9' k56. ; u dng tu mc ni ti p ng thi vi " + &'( #2? 8 ! $'( $'( vi nhauth t3n ! dao ng cua mach l

1. -9 k56. V. T' k56. C. 9' k56. D. F9 QH|.C2 0 : > t mach dao ng LC c in tch cc ai trn mt ban tu l %' & 9.2'"U C: cng dngin cc ai trong mach l ,' & 2' m1. Chu k dao ng in t trong mach l $

1. 9 !. V. ':9 !. C. ':'9 !. D. 9599 .C2 0F: Grong mach dao ng in t LC: khi in tch gi/a hai ban tu v cng dng in trong

mach l3n lt c biu thc $ % & %' !in)t (C+ W i & ,' co!)t (1+ : th nng lng in t cua mach c biuthc l $

1.C

q+

-

-'= . V.

-

-' L( + = . C.

-

-'

- ( L+

= . Q.-

-'

- q L+

= .

C2 0 : > t mach dao ng LC c L & ':2 5 v cng dng in cc ai trong mach l ,' & ':21. ;ng lng dao ng cua mach l $

1. Y.2' "T N. . F.19 j. C. Y.2'"Y N. Q. Y.2'"Z N.C2 0J: > t mach dao ng gm mt tu in c in dung C v cun cam L. 7in tr thu3n cuamach P & '. Viu thc cua cng dng in %ua mach l i & 9.2'"-!in(-.2' 8,+ (1+. 7in tch cc aicua tu in l $

1. 2' "[ C. . ).19 C. C. 9.2'"[ C. Q. U.2'"[ C.C2 0K: > t mach dao ng in t c L & Y m5 W C & T2:U z : hiu in th cc ai trn tu l U .Cng dng in trong mach khi hiu in th trn tu l 9 c gi tri l $

1. YY m1. V. ':9Y m1. C. ':YY m1. Q. ':9Y 1.C2 0 : Grong mach dao ng LC: in tch cua tu in C c gi tri giam t gi tri cc ai %' n '!au thi gian bao nhiu w

1. t &-

T . V. t & G. C. ,

9

T . Q. t & -G.

C2 9: >a ch dao ng LC c C & 2' z : L & ':2 5. Gai thi im uC & 9 th cng dng in i& T' m1. Cng dng in cc ai trong mach l $

1. 9' m1. . F9 8A. C. Z' m1. Q. U' m1.C2 1: Grong mach dao ng LC l tng: c !au nh/ng khoang thi gian nh nhau t' th nng lngtrong cun cam v trong tu in lai bng nhau. Chu k dao ng ring cua mach l $

1. G &-'t . V. G & -t' . C. G &

9't . Q. G & 9t' .

C2 ): Oht biu no !au 3< #1, khi ni v nng lng cua mach dao ng in t LC c in trthu3n khng ng k w

1. ;ng lng in t cua mach dao ng bng nng lng in trng cc ai tu in.V. ;ng lng in t cua mach dao ng bng nng lng t trng cc ai cun cam.C. N '( *- '( %+4' ,- ! / 8 !" # $ %&'( 3+4' %&/+ , 2' "$ ' ,">$ ," + (+ '.Q. ;ng lng in trng v nng lng t trng cng bin thin th=o mt t3n ! chung.

1


20/28


21/28

in p hai 3u ban tu in bng 0 ' . i tri cc ai ,' cua cng dng in trong mach c tnh bng biu thc $

1. LC U ( '' = . V.C L

U ( '' = . C. LC

U ( '' = . Q. LC U

( '' = .

C2 F): >a ch dao ng LC l tng gm tu in c C & ':Y z v cun d3< c L & Y m5: in tr r &':2 . 7 du< tr dao ng iu ha trong mach vi in a p cc ai gi/a hai ban tu in khng i

bng Z th phai cung c3 p cho mach mt nng lng c cng !u3t l $1. -:U.2' "9 . V. 9:U.2'"9 . C. T:U.2'"9 . D. 15K.19 k.C2 F0: Oht biu no !au 3< 70 ; w

1. Cu/ng ging nh !ng 3m: !ng in t c th l !ng ngang hoc !ng doc.. S$ '( %+4' ,- * $'( '( '( 6 * ' ,7 ?4 ' %- ! ,7$'( 8$ + 8&+ ,7-'(.C. #ng in t khi g p !ng 3m trong iu kin thch h p th giao thoa vi nhau.Q. #ng in t mang th=o nng lng khng bi mi trng h3 p thu khi lan trua ch dao ng LC c in tr khng ng k. Grong mach c ! bin i %ua lai gi/a1. in tch v in trng.

V. hiu in th v cng dng in.C. in tch v dng in.D. ' '( *- '( %+4' ,7- '( 6 ' '( *- '( ,- ,7- '(.

C2 FF: Chi ra c3u pht biu #1,. ung %uanh mt in tch dao ng1. c in trng. V. co t trng.C. !$ %+4' ,- ,7- '(. Q. khng c trng no ca.

C2 F : Shi ni v dao ng in t trong mt mach dao ng: iu khng inh no !au 3< l #1, w1. 7i n tch trn cc ban tu in bin thin iu ha th=o thi gian.V. Cng dng in trong mach bin thin iu ha th=o thi gian.

C. 5iu in th gi/a hai ban cua tu in bin thin iu ha th=o thi gian.D. N '( *- '( %+4' ,7- '( 6 ' '( *- '( ,- ,7- '( * % + *- '( Q"&'( %&/+.C2 FJ: > t mach dao ng gm mt cun d3< c h ! t cam L & 2'"Z 5 v mt b tu in m indung tha< i c t Z:-Y.2'"2' z n 2' "U z. L3< & T:29. G3n ! nho nh3t cua mach dao ng n< bng

1. - >56. . 15 MH|. C. -:Y >56. Q. 9:2 >56.C2 FK: Chsn c3u tr lKi 7 ;.

Qao @ng iJn t nEo dMi 3< ch c ch n khng cA ! to nhiJt do hiJu ng Nun " L=n A. D $ %'( 7+4'( *w ,-x'(. V. Qao @ng c ng b c.

C. Qao @ng du< trH. Q. C@ng h ng dao @ng.C2 F : Cho m@t cu@n d3< thuBn c m cA @ t c m L vE hai t_ iJn C2 vE C-. Shi m c cu@n d3< ringvMi t ng t_ C2 : C- thH tBn ! dao @ng c]a m?ch tng ng lE D 2 & Z.2'T 56 vE D - & U.2'T 56. GBn !dao @ng c]a m?ch khi m c `ng thKi cu@n d3< vMi C2 n i ti p C - lE $

1. 2' 56. V. 2'' 56. C. 2 k56. D. 19 QH|.C2 9: 7 tm !ng c bc !ng X trong m< thu v tu


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1. ':Z m. V. Z m.C. Z' m. D. 99 8.

C2 ): Shi mc tu C2 vo mach dao ng th thu c !ng c bc !ng X2 & 2'' m W khi tha< tu C2 bng tu C- th mach thu c !ng X- & 8Y m. Shi mc hai tu ni ti p vi nhau ri mc vo mach thmach bt c !ng c bc !ng l $

1. 9' m. V. U' m. C. 2-' m. D. 9 8.C2 0: #ng in t

1. khng bi phan a . V. khng bi khc a .C. l !ng doc. D. ,7 ?4 ' %- ! ,7$'( !"2' Q"&'(.

C2 : >a ch chon !ng gm mt cun cam c t cam ':''-Y m5 v mt tu in c in dung C& 2 pz. L3< & T:29W tc nh !ng trong ch3n khng c & T.2'U m4!. #ng in t m m< thu cc bc !ng l $

1. [9- m. V. T29 m. C. )5 K 8. Q. T2:9 m.C2 F: #ng in t

1. l !ng doc.V. tru t mach dao ng gm mt tu in c in dung C bin thin v mt cun cam c tcam L cu/ng bin thin c. 7iu chinh L v C c th bt c !ng v tu


23/28

V. #ng di c bc !ng trong min 2' Y m 2' T m.C. #ng trung c bc !ng trong min 2' T m 2' - m.D. S$'( '( ' !$ 3- ! $ '( ,7$'( 8+4 ' 19 8 1 !8.

C2 J1: >a ch chon !ng m< thu v tuach c th bt c !ng v tu


24/28

V. =ct cng in trng E c th hng th=o phng truach dao ng LC gm tu in c in dung C & ':- z v cun cam thu3n c t cam L& - m5. Vit cng dng in cc ai trn L l ,o & ':Y 1.

Shi cng dng in trn L l i & ':9 1 th hiu in th gi/a hai ban tu l bao nhiu w

1. -' . . 09 V. C. 9' . Q. Y' .C2 KF: > t mach dao ng LC c in tr thu3n khng ng k ang thc hin dao ng in t tdo. ;ng lng in trng cua tu in trong mach lun lun

1. khng i. V. giam d3n th=o thi gian.C. 3+4' ,"+4' , 2 ' "$ '. Q. bng na nng lng cua mach.

C2 K : i c l tc nh !ng trong ch3n khng: cng thc c inh bc !ng cua dao ng int t do trong mach dao ng LC l $

A. )l! LC . V. X & - T LC . C. X & - cC L . Q. X &

LC c -

.

C2 KJ: > t mach dao ng gm mt cun cam thu3n v mt tu in phng. Shi khoang cch gi/acc ban tu giam i - l3n th chu k dao ng trong mach

1. tng - l3n. V. giam - l3n. C. , '( - *2'. Q. giam - l3n.

)


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C2 KK: > t tu in c in dung C & 2 z c tch in vi hiu in th cc ai 0 o . #au chotu in phng in %ua mt cun cam thu3n c h ! t cam L & [ m5. Coi - & 2'. 7 hiu in thtrn tu in bng mt na gi tri cc ai th khoang thi gian ngn nh3t k t thi im ni tu vicun d3< l $

1. 2:Y.2' "[ !. V. ':8Y. 2'"[ !. C. 19 . Q. T.2'"9 !.C2 K : >a ch dao ng cua mt m< pht v tu E $'( $'( 6 + C1 6 1 E C= K E.C. h= p !ong !ong vi C2 v - pz C 2U pz.Q. h= p !ong !ong vi C2 v 9 pz C 29 pz.

C2 1: >a ch chon !ng gm cun cam thu3n L v hai tu in C2 : C- . ; u chi dng L v C2 th thuc !ng c bc !ng X2 & 2'' m. ; u chi dng L v C- th thu c !ng c bc !ng X- & 8Ym.Shi dng L v hai tu C2 : C- mc !ong !ong nhau th mach thu c !ng c bc !ng l $

1. -Y m. V. Z' m. C. 1)F 8. Q. 28Y m.C2 ): > t mach dao ng LC gm cun cam thu3n c t cam khng tha< i v mt tu in chai ban phng t !ong !ong cch nhau mt khoang c inh. 7 pht ra !ng in t c t3n ! daong ring tng - l3n th ph3n din tch i din cua hai ban tu phai

1. tng - l3n. V. giam - l3n. C. (+ /8 *2 '. Q. tng 9 l3n.C2 0: ; u mc thm mt tu in !ong !ong vi tu in trong mach dao ng th t3n ! ring cuadao ng in t t do trong mach !=/

1. khng i. V. tng ln. C. (+ /8 %+. Q. phng n khc.C2 : >a ch dao ng bt tn hiu cua mt m< thu v tu < cth bt c cc !ng v tua ch LC l tng gm tu in C v cun cam L & 2'"9 5. Shi cng dng in %ua machl i & 9.2'"-!in(-.2' 8 .t+ (1+ th hiu in th gi/a hai 3u ban tu l $

1. u & U'!in(-.2'8 .t+ ( +. V. u & 2'"U!in(-.2' 8 .t+ ( +.

C. K9 +'@).19J ., -

B @VB. Q. u & 2'"U!in(-.2' 8 .t *

-

+ ( +.

C2 : > t mach dao ng in t l tng c L & Y' m5 v tu in C. Cng dng in trongmach l i & U'!in(-'''t+ (m1+. Gai thi im cng dng in tc thi trong mach bng gi tricng dng in hiu dung th hiu in th gi/a hai ban tu in l $

1. - . V. - . C. - - . D. - V.C2 J: Chon c3u tra li 70 ;.

Qao ng in t v dao ng c hoc1. c cng ban ch3t v3t l.

)F


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V. c m ta bng nh/ng phng trnh ton hoc ging nhau.C. c ban ch3t v3t l khc nhau.D. C / !2 6 C %4 % '(.

C2 K: Chon c3u tra li #1,. Grong ! khi cua mt h thng pht thanh v thu thanh dng !ngin t: b ph3n c trong m< pht l $

1. >a ch chon !ng. V. >ach tch !ng.C. M !" 3+4' %+4. Q. >ach khch ai 3m t3n.

C2 : Grong cc thit bi in t no !au 3


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C2 19 : Chon c3u tra li 70 ;. # ng v tu


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1. 7 pht !ng in t: ngi ta mc phi h p mt m< pht dao ng iu ha vi mtant=n.

V. 7 thu !ng in t: ngi ta phi h p mt ant=n vi mt mach dao ng.C. D $ %&'( %+4' ,- ," %- ! ,- 8 !" !"$ ' $ '( * # $ %&'( ,- #$ 6 + ,2' & 3 '( ,2 '

& 7+4'( ! / 8 !".Q. Qao ng in t thu c t mach chon !ng l dao ng cng bc c t3n ! bng t3n !

ring cua !ng.

Chuong III.thuvienvatly.com.7571c.36715

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