- Cho m4ch <liQn nhu hinh v6. - Bo qua di€n tro cta ampe kE vd ddy n6i.. - a.Khi Rr=8f. - linn so cnr cua ampe Ke. - Tinh c6ng su6t ti6u thq tr6n R:.. - Ngudi thri nh6t vd ngudi thf. - Tim dQ lon vdn tdc v3 cr)a ngudi thri ba.. - C6 ba binh dgng ba chdt.long c6 nhi€t dung ri6ng khAc nhau "a q6^1C 39 diiC h6a hqc voi nhau. - tr j to oc ud tr = +5 0c- Ntiu dd m6t nua chdt l6ng o binir 1 sang binh 2 thi nhiQt d0 cna hdn hqp khl can bing nhiQt ld t. - I 5 oa a6n nilu d6 mdinua chdr tOnfo Uintr I sang binh 3 thi nhiet ilQ khi c6n bing nhiQt lir tr. - N6u d6 ci ba chAt ldng vdo mdt binh thi nhi€t d0 h6n hqp. - Rr vd tinh c6ng su6t ti€u thu tren doan mach AB.. - VC dd thi bi6u diSn su phg thuQc crla c6ng .uAt tren do4n mach AB vio cudng d0 ddng diqn mach chinh khi Rr gi6m dAn tt 72 O d6n 0.. - c dbt vu6ng g6c v6i truc chinh cia mQt th6u kinh hQi tp vd crich quang ' Um 30 cm. - Th6u kinh c6 tieu cqr 20 cm. - nnh A'B/ cia AB qua thAu kinh le anh that hay inh io ? X6c tlinh vi tri, dQ lon cia inh d6'. - Ngudi ta d{t mQt guong phing d sau th6u kinh, ng[ieng v6i truc chinh mQt g6c 450, cit. - truc chinh tai C v6i OC = 30 cm, nhu hinh v€. - Hiy trinh biy cSch vE inh cria vrit AB tao boi hd th6u kinh vd guong phing'. - Bi6t ring di€n tro cua cudn ddy it vdng nho hcrn diQn tro. - .,ri."0". - Cho ph6p su dpng : m61 ngudn pin, mQt la ban' mQt b6ng ddn (c6 dign 6p dinh mfi lon hon dipn 6p nguiin pin), mQt kho6 diQn K vd c6c dAy n6i'. - md kh6ng duoc mic b6ng ddn n6i ti6p vOi ngudn diQn vd vdi khoa K'