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DE THI KHOI 11 CB I 2OA9 2O1O Thdi gian : 60 phfr Cf,u2(1 d) Cho Uidt tgt luQn nhrrtdnio li hiQn trlgng cim fng tliQn til ? Ph6t Uidu ;Ointr tugt len.xd(Lentz)v6chi6u.ddngcti0nc6mr?ng?.,l Dinh nghia drrdng sfc til. Cho bidt cdc tinh chdt cria dudng srtcft ? a , Cho bi6t nhu thd nio th hiQn trrQng khrlc x4 6nh s6ng . Ph6t bidu A6n lugt khric x4 :l Dinh nghia vd ilriQn trrqng phfrn x4 toin phdn . Cho bidt di6u ki€n dd c6 hiQn tuQng phin xa toin phdn ?: 91ls (1d) ? I Cho ddng itiQn thSng c6 crrdng db I = 0,5A cl{t trong khdng khf . a Tinh tlQ ldn cim fng tU t?i didm M cr{ch ddng tli€n r = 4 cm . blBidt cim rlnetfi,tai didm,N le P= lOaT . Tinh khoingcdchtil N ddn ddng 40n ? : . e0u41d) : M6t vft s6ng AB d{t vu6ng g6c vdi trgc chinh cui 1 thdu kinh phfln k) c6 ti6u cg f 1 = 10cm vi cdch thdu kfnh 15cm . Xr{c Oint vi tri cia 6nh , cho bidt 6nh:nh6 hdn hay ldn .r , Cho 2 ddng CliQn Ir =12=54 chayttong hai ddy ddn dii , song song , cdch nhau I , dlVG vectd ctm fng tt tdng ho.p t4i M , c6ch dty thrl nhdt 10cm vi cdch ddy thtihai ,1 MOt l6ng kinh thriy tinh c6 chi6t sudt n= ,4L4,. Tidt diQn th8ng ctia tlng kinh li tamgi6ctI6uABC.Chi6u1tias6ngnHmtrongm4tphngcfiatidtdiQnth8ng,tdiAB A,,t6i450.TinhgoclQchcfiatias6ngqualdngkinh?,;. mot soc I . 9 L e { MOt m{t binh thrrd:rg c6 v6ng mac c6ch thrly tinh tfrd t do4n 15mm . Hdy tim ti6u c{ cria thriy tinh thdkhi nhtn vQt AB trong 2 tnrdng hgp sau : IF ry T r : : Sz Si , rt0?+3 S: ilrt J0 r 8::., Jc+ Et K{tM TRA HOC xi z NAM zoll LtIT, COnfut ( trUigiln:60 phfit) Cdu I :dDinh nghla tir tnrdng v dulng stc tt. 3 :Unri6t Jong th(rc urfi tu. tU tac dung l0n tloan diy Afrn co ctridu ddi l, cudng ( X A }( X L7 20 18 X \,/ n- Me phbng 30 _k V l2 / X X Didm F* e\ kf \-"" ,.tli i.rr i o*S i{!ir;, !.'i.iig X D -Cffu 1: HiQn tuqng t.u cim ld hiQn tuqng cim img tliQn tu sg bi6n thi6n tu th6ng qua mpch gdy boi t -.-A+^ra -A;sU chuyOn ilQng cria nam chdm v6i mpch B sU bi6n thi6n cria tir trulng filei aal C.sU bi6n thi6n cria chfnh rodrg d6 fldngcliQn mpch D.sU chuy6n dQng cta m4ch vdi nam chdm - C6u 2: MQt ddng diQn chay mQt diy d6n trdn 100 vdng , duorng kfnh 20cm 10A thi q6m ung ft t?i tdm cdc vdng ddy ld "4 Ar2mT B A,Zn mT C" 20n pf B, 2n mT Cfiu 3: Fh6t bi6u ndro dudi dfly le dfng ? Tt trucrng bdn 16ng 6rrg d6y d5n mang ddng diQn /r Iudn bflng B" ti t9 vdi chiAu dei 6ng d6y r C ti lQ vcri titlt dign 6ng D le d6ng d6u v6i cudng dQ : dAy cfiu 4: EO len cira l$c Lo-ren-xo kbafumgphu thuQc viro A d0 lon cria cim ring tir ts" d0 ldrn vfln t6c cira diQn tfch C khOi tuqng cta dien tich 5: Ong $dy (t) gO cung ti6t diQn vdi 6ng d6y (2) nhung chi€u dai Ong vd nhi6u hcrn gdp b6n l6n Ti s6 hq s6 t.u cim cria 5ng (l) v6i dng (2) ld A"1 8.4 c.2 D.8 C.f,q sO vdng ddy dcu 91" 6: MQ_t doan ddy d5n dii 0,5m mang ddng diQn 10A , dflt vu6ng g6c mQt tu trudng d6u c6 d0 lon cim img tir 1;2T N6 chiu mQt lgc tu t6c dpng li A.dNI B 12N c"O(bt) D 18N Cflu 7: Tp! mQt OiCm cdch mQt d6y adn ttring ddi vO hpn mang dong diQn 5A c6 c6m rmg tu 0,4pr N6u cucmg dQ ddng diQn dey dEn tEng th6m lsAthi cim mg r& tpi Ai6*d6 c6 gi6 tri ld A B C D^ 1,6tr[ C6u 8: MOt diQn tichbay vdo mQt tu trudrng il6u v6i vpn t6c 2.105m/sthi chiu mQt lgc Lo-renxo c6 d0 16n 10mN.N6u dign tich d6 gifinguyCnhucmg vd bay v6i vpn tOc O.tbsm/s vio thi d0 lcrn luc Lo-ren-xo t6c dpng l6n diQn tfch ld 0,2/iT AgpT l,2pT Trang ll3 - Me Ae tni 209 A" 40mN cffu 9: cho hai day {an 35mN 25mN E' ia, u* \ [r" 30mN J\,II].I\ D" ^ a