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i"r,#
Sd tht? tu vra
rrtl_
theo phuong vu6ng goi vcri c6c irtrol;;;;i-:a;;ilt ffi::ilX;: [:;.r._3il,
trdn bdn kinh R=lOcm 'l"inh v6n tdc cria c6c eiectronl Uidt:
"=_t,O.l0,,rC, ,.r,0, ,oqn,
cfia e=9,I.lo-,,kg
cdu 2 Hai d6y o6n thf n'g aai song song vi c6ch6huu rOcm vdc6 ddng diQn
*urreEidu
chav qua, c6 cudng do ra rrrz-riAnE-m trong ,rilorrar, ilrr# liarn na nim trong mat phing hinh v6i6"i, alr aar
lrrlg dgng oie"n r, ta +cm, c6ch d6y dan mang ddng diQn 12
lil6cm C6m ting tir tai ,fid* Iv[ c6 gi6 tri nio ,u, iafl
yro -o r w w-5r -ir.io-,,
'* chi ra cdu sai r 'r / P ei"tri khdc
L-:.ti, me mOi it, tir.ing d€u t6c duns r6n mQt do?n d6y dan ti te tr,ran ,Ji
!Dd0 ldn ctia c6m rng tir " '' -"F;;dd jo;.* diQn
r
/aaoddi /Ca"q rChon cfra doan aa! aan nim trong ru truong/ X go"o giiia v.ctoivd v6cto B'
MOt khung ddy phlng nlm trong tu trudng ddu, mflr phing khung chr?a c6c dudng srfc
tu' Girim cdm fng tu di hai la'n vi tang culng dQ ddng di-6n rrong khung l6n
4 ldn thi
g.^T:, ngSu hJc tU-t6c.d.Ung l6n khung se ta'ng ten
f?,in_ W+ rdn -
fr6" )aaa rdn
' c4g s' Mot doan h:I ,.c6 ddng ajen r aat'trong tt
jrunng ua, ;#* ung tu B'hep vdi chi6u dong diQn mQt g6c ,i t-si tu r6c dung tei i aoan d6y c6 gi6 tr! I6n nh6t khi:
fia:o
ffi theo phuong vu6ng , chum .,ro*, gric #.,-l]'r[ p" v6i cdc rgn* r,u ffi]'X ; ;; ;;;#i;H;,
dr"rdng ,,r"i,r
"J, "a, ,-o.;;ffi, m/.s cdn phrfli cret
0el
il *?_-r -*-ii
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A
B
C I
%
21 22 23 24
B
C
D
Dfi KIfiM TRA TnXc I*GHTEM
M6nvarry $NC
Thdi Sian Idrn bai 45 phrit
(30 cA u trdc nghie m)
8 -ll
r"4
T9 I20
2s120
\
ong
trang 1
Trang 2Ot dien ftudng adu g?O phuong, chi€u, vi ctrdng d0 nhu thd ndo dd electron c5 thd
y th*-netua vtng kh0ng giah cfia til trrrdng d6?
{"Ung phrrdng ngrrQc chi6u vdi mOt lyc lorenxo vi c6 E=7dl0av/m
flEcDng phtrong cing chidu vdi mOt luc lorenxd vi c6 E=6.iOovlm
[tcing phuong nguqc chidu vdi mQt h,rc lorenxd v] c6 E=6.10av/m
pd.Org phuong
"tng chi6u vdi m$t h/c lorenxd vd c6 E=7.t0av/m.
/Cfiu 7: Chon cAu sai'
' MOn,en ngfiu ldc ti/ iir,.: clung l€n mQt khung diiy c6 db:rg ili6n dIt trong tU truong ddu
Wi rc r,di diQn tich khung
fu rOgi6 tri ldn nh{t ktri m4t phring khung vu(ing g6c vdi dtrdng stfc til
t [yfrVhV tliuQc cUdng dQ clirng diQn trong khung
p ti lQ vrli cdm fng tr)
'etsg Uch<;n cdu dfirrg
Cf,lA, ii, hlc lorenxcl tf c dUng l6n 1 aliQn tich q chuy(in <lQng trdn troug tif trtldng
\flhrr,1ng vd t6m cfia (idrlng trdn qu! d4o chi khi q>ti
fu nuOrrgvd tdm cfia drfr)ng trdn qu! d4o chi khi qC)
'fotuOn lufin htlCng v6 iAm cria tlffdng trdn quli,ilpo , i r i ,.
/Ot ,n rokdt lufln duoc vi r;fiya Uidt adu cfra aiQn t(c:h 'iir ciri6u ctia vdutoTt
C6u 9: Cit1a cdc electr{)n trong i chiim tia catdt c6 niriitrl.r tddng tdc'gi?
Yfjdi cd t$ong tdc dirlri nl Chi cfr rfirrrg t:ic tr}
-
Q"Oca ttrOng i.ric tliqrr vir tif t!/ kh0ng r.:f: tr.Itfng tdc rrio cfr
/Ca,t-l-QtQuy tdc bin ti:y trdi rlDng ad tam g)'/
pJXric dinh phrrtlng vI 'r;tridu cua cdm ffng t&'cria I ddp.g diOn
\O Xec Airrh phuUng vi ctridu cfia itlc ttYdo I nam chtm t'.ic dung lOn I nam chffm khric
tpXa" dinh phucrng vd qhidu cfia lyc tirdo n:Qt ddng dipn tdc dr,rng lOn mQt nam chf,nr
fu4ac clinh phucrng vir chidu cua lpc til md m0! tir truirng tac dpng l6n mQt dong diQn ftAg-[!-rt ktrung rJ6.y tri:n bdn kinh 30 cm gdm l0 v0qg,(lay.'Cudng d0 clbng diQn trong nr6i vdng d6y ln 0.3A Cim frng til tai tAm cfia klrrrng.ildy c6 gi6 tri
fio,zt.rir:6i pri,sor F>,zs.le fr yz.so.l0 sr
/ Ccn l2; Chgn cdu df rr.s / , /
I
-( I']hrrdng cfra hlc Loren,rrl
n)ng vdi phuong cill vdcto cf,m fng tit
ttrDng vdi phrfdng cri l r16ctd 1,{n tdc cria h4q , ,
vuOng g6c'vdi ,;IUdfig srtc tUnhrlng trilng ydi v6ctcl yrin toc cria h4t
vu6ng.g6c vdi dtft)n;l sfc til vi t'6ctd vfln t6'g cria h4t ,
-e$-u11: Hai day d6n nrang dpng cliQn co cuorrg dg I1;'i{ li ! 3A chqv igY: ihq"
trong hai tldy dfrn thirrg rldi, songsong vh c6ch nhau 4crn.'IJiri 2 dong dign d6liil-t hayTa)'
nhau vrii rnQt lpc co dg l6n li bao nlri6u? n€u dong -di€n n,r.y tdc dyng I0n I Ep cria di:ng
iier'r.i.'."',ft[il;]r, ;; il;' ;.il: ';.,"'-'fu;il' ;il,'';;i r dF : ilr:' r.u''
Whttnhau viri lgc F:3.10-7N / Wat nhau v6i luc F = 3.10'-5N
//
I
1?,
treng2
Trang 3cau-l4ilvlQt d6y d5n thang ddi cir ddng
dign cuong do I, ciim rfng til rai
kho{ng rc6 gi6 tri:
-I'didm ciich dAy I
C6 dd-nS cliQn qua diiy l,ngugc chidu vdi ddng diQn qua d6,y 2 .
Chi cdn c6 I dbng diQn m{nh qua dbty Z
* CO dbng diQn qua diiy I ctng ctridu vOi ddng diQn qua d6,y 2
tr^:::^rn:- vinh cuu nim v6n ltou" nam ch6m vinh cuu chuydn dOng
/ Au 19: MQt 6ng d6y c(r chidu dai I, c6 N vitr{g, c6 ddng diqn cr/dng d0 I chey qua c6m
rlng tU tai rnQt ctidm b6n rrong dng d6y c6 gi6 tri: n
mar
rna r
vdi
v6i
phf,ng hinh vC, song song c1ng chidu vdi nhau ph8ng hinh ve, song sont n*nqc chidu vdi ;;,
mat ph8ng hinh ve, ctng chidu vdi nhau
rn4t phtng hinh ve, ngugc chidu v6i nhau
(C6-u 23: I dfly oan th6ng dii c6 ddng oien/nlm trongmat ph/ng hinh v6 Mr,Mz li hai
oidm d trong mlt phfrng hinh ve odi xrnng nhauqua iav ,e",o"oam rlng iJi*, ,
*C-niy c6 tfch cha't:
Y CDng"nhm ffong
'PCDng nhm rong
/pcfing vu6ng g6c
CDng vu6ng g6c
Trang 4fi"
$r g*rjJ (-.,.
CAu24,?ta
Pv le vdc td vlirr tdc cria hat mang diqn q<0
B la vdc to cd m tfng tir * ,
tg<(,
/1trr ,. Y,I::.1* rX*.rrr-"S mqit phing hinh v6 vi hop vtli nhau I ggc u
Luc lorenx d t6c dung ic rr hat mang diOn q co:
vuOng vuOng
v6,c6
'"1 io *?
b
W Phurdng nhm rrong ,.,iirr ph8ng hinh ve ,
Phuong nlm rrong nr{ t phing hinh v6,
Itrhgrong vuong g6c
'r1i mar phfrng hinh
hf ng hinh v6
huong vu.dng g6c
'dJi mat phfrng hinh vE , cd chi6u fi phia trudc ra phfa sau cria phfrng hinh v6
*-)
g6c vdi ul.il ng chidu vdi B'
gdc vdaB; cr)ng chidu vdf
chidu tr) phia sau ra phia rrddc cria rnfrt
m4r
-*
eY
1T /,
-t'
/"'
YTA:n:p cdc 9y1"g srfc til cria tir trudng gei li tU phd
y"r'iir!ri::., vdi dudng srl'c ril tai m6i oidm ffDng vdi trsc quay cfia
kim nam chdm thfi
c6u 28: Mot khung df,y hinh chff nhdt ABCD c6 ddng di6n craurong I tir rrudng cr6u c6
[:l*t*#X,fl.,'fr::':,'f"X:,ouons cinm r?ng "v.n o rnen cria ngiu rdc tu tiic dung
p v=ntirinio,) -; -'-'
W= BrSsin0, pM= g
H/M =,s
I caozg' lion mang oi(rn tidh q, khdi
rrrgng m, chuyd
";u;:;*I ,u f\;r',
,-:il'trhHJii,l:'.'.ti?,1*iir*;:i:,"1^ln::f,.f ;;,ch2q,*rdir,rsng4rn,
vrruvri, ugng vol roc dQ @l_2) trong til trudng n6i tren thi br{n trrr, qry a*;;; *: -,,,,,
6^aor ao,11 #[ ;u,1 *,, :,::" ##,;;'; ;,:##; i; r,
;?#ffXr;}i* o'a I Do4n oi, '"*;;;;,tff ffi:ffi, r6n doqn ddy c6 gi6
y'= go+N ,
P=go8N ,@, , lr
fif,uoqgir{ tri khric