au 11) Trong cac phan i m g h^t nhan sau, phan ung nao thu nSng lugng?
ap Ị t a m . Ạ " j U + n C. HtRa 4 ^ M o + '^^La + 2n B. '^C + Y ^ D . ^ H + ^,T • 3 ( ^ H e )
au 12) Trong m^ch xoay chieu nhu
hinh ve: Biet dỉn ap h i f u dyng hai dau cupn day bSng d i f n ap hai dau ty C. N h u v^y: B . coscp = 1 M j H e + n N B A . U M N = U A B - C . U A NA N U M N - > U N D . U N B > U JAB
]au 13) Dôn m^ch A B gom mpt ty di^n C mic noi tiep v a i mpt bien t r a c6 gia trj tir 0 den 600 Q. D i ^ n ap giira hai dau dôn m^ch U A B = U yfl sincot. Dieu chinh
con ch^y de bien t r a c6 gia t i j R = 400 Q t h i cong suat toa n h i f t tren bien t r a max va bang 100 W . K h i cong suat toa nhi^t tren bien t r a la 80 W t h i bien t r a
CO gia trj
A . 2 0 0 n B . 3 0 0 Q C. 400 Q D . 500 Q
Cau 14. M ^ c h xoay chieu R L C mk noi tiep , ty C thay doi : U R = 60 V ; U L = 120
h^iti V ; Uc = 60 V . Thay doi ty C d i f n ap hi^u dyng 2 dau ty C la Úc = 40 V t h i dỉn ap hỉu dyng 2 dau di^n tra R b4ng
Ạ 13,33 V B . 53,09 V C. 80 V D . 180 V au 15) Trong thang song dỉn tir t h i au 15) Trong thang song dỉn tir t h i
Ạ tia tur ngôi de lam ion hoa chat k h i nhat. B. tia Y C O nSng lupng photon Ian nhat. C. anh sang nhin thay c6 v^n toe nho nhat. D. song v6 tuyen dỉn c6 tan so Ian nhat.
Cau 16) Chpn phat b i l u dung:
Ạ Song di^n tir va song ca hpc cung la song ngang va cung truyen dupe trong chan khong.
B. K h i di^n tich trong m^ch dao dpng L C b i l n thien v a i tan so f t h i nang lirpng
d i f n tir se bien thien tuan hoan v a i tan so 2f.