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Sd tht? tu vra
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ffi^,r"iluar ra" I ru t.d'rs dil;ffi,oozi
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 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 cfra doan aa! aan nim trong ru truong/ X go"o giiia v.ctoivd
v6cto B' /Ca"q rChon
c6u dirng /
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 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 , chum .,ro*, #.,-l]'r[ p" rgn* r,u ffi]'X
.; .;; ;;;#i;H;,
theo phuong vu6ng gric v6i cdc dr"rdng ,,r"i,r
"J, "a, ,-o.;;ffi, m/.s cdn phrfli cret 0el
il *?_ii
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A
B C I
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21 22 23 24
A I
B C D
Dfi KIfiM TRA TnXc I*GHTEM
M6nvarry $NC Thdi Sian Idrn bai 45 phrit
(30 cA u trdc nghie m)
8 -ll
r"4
T9 I20
2s120
\
ong
(2)',
Ot dien ftudng adu g?O phuong, chi€u, vi ctrdng d0 nhu thd ndo dd electron c5 thd
y th*-netua vtng kh0ng giah cfia til trrrdng d6?
{"Ung phrrdng ngrrQc chi6u vdi mOt lyc lorenxo vi c6 E=7dl0av/m
flEcDng phtrong cing chidu vdi mOt luc lorenxd vi c6 E=6.iOovlm
[tcing phuong nguqc chidu vdi mQt h,rc lorenxd v] c6 E=6.10av/m
pd.Org phuong
"tng chi6u vdi m$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 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 q>ti
fu nuOrrgvd tdm cfia drfr)ng trdn qu! d4o chi 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 i chiim tia catdt c6 niriitrl.r tddng tdc'gi?
Yfjdi cd t$ong tdc dirlri nl Chi cfr rfirrrg t:ic tr}
-
Q"Oca ttrOng i.ric tliqrr vir tif t!/ kh0ng r.:f: tr.Itfng tdc rrio cfr
/Ca,t-l-QtQuy tdc bin ti:y trdi rlDng ad tam g)'/
pJXric dinh phrrtlng vI 'r;tridu cua cdm ffng t&'cria I ddp.g diOn
\O Xec Airrh phuUng vi ctridu cfia itlc ttYdo I nam chtm t'.ic dung lOn I nam chffm khric
tpXa" dinh phucrng vd qhidu cfia lyc tirdo n:Qt ddng dipn tdc dr,rng lOn mQt nam chf,nr
fu4ac clinh phucrng vir chidu cua lpc til md m0! tir truirng tac dpng l6n mQt dong diQn ftAg-[!-rt ktrung rJ6.y tri:n bdn kinh 30 cm gdm l0 v0qg,(lay.'Cudng d0 clbng diQn
nr6i vdng d6y ln 0.3A Cim frng til tai tAm cfia klrrrng.ildy c6 gi6 tri
fio,zt.rir:6i pri,sor F>,zs.le fr yz.so.l0 sr
/ Ccn l2; Chgn cdu df rr.s / , /
I
-( I']hrrdng cfra hlc Loren,rrl
n)ng vdi phuong cill vdcto cf,m fng tit
ttrDng vdi phrfdng cri l r16ctd 1,{n tdc cria h4q ,
,
vuOng g6c'vdi ,;IUdfig srtc tUnhrlng trilng ydi v6ctcl yrin toc cria h4t vu6ng.g6c vdi dtft)n;l sfc til vi t'6ctd vfln t6'g cria h4t ,
-e$-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 4crn.'IJiri 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
//
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(3)cau-l4ilvlQt d6y d5n thang ddi cir ddng
dign cuong I, ciim rfng til rai
kho{ng rc6 gi6 tri:
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I'didm ciich dAy I
C6 dd-nS cliQn qua diiy l,ngugc chidu vdi ddng diQn qua d6,y
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
B: diQn tic-h.tuffi,iorg
Vruc diOn rich drlng y6n
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 rn4t phtng hinh ve, ngugc chidu v6i nhau
X:o::uY.^ I ]Mzmudng Psovdng Nzsvdng
(C6-u 23: I dfly oan th6ng dii c6 ddng oien/nlm trongmat ph/ng hinh v6 Mr,Mz li hai oidm d 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
li \
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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
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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 phfa sau cria phfrng hinh v6
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g6c vdi ul.il ng chidu vdi B'
gdc vdaB; cr)ng chidu vdf
chidu tr) phia sau phia rrddc cria rnfrt
m4r -* eY
1T/,
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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
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,-: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
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6^aor ao,11 #[ ;u,1 *,, :,::" ##,;;'; ;,:##;
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;?#ffXr;}i* o'a I Do4n oi, '"*;;;;,tff ffi:ffi, r6n doqn ddy c6 gi6
y'= go+N ,