C\u00e2u 1:<\/b>\u00a0Trong m\u1ea1ch dao \u0111\u1ed9ng \u0111i\u1ec7n t\u1eeb l\u00ed t\u01b0\u1edfng v\u1edbi t\u1ea7n s\u1ed1 g\u00f3c \u03c9. Khi \u0111i\u1ec7n t\u00edch t\u1ee9c th\u1eddi c\u1ee7a t\u1ee5 \u0111i\u1ec7n l\u00e0 q th\u00ec d\u00f2ng \u0111i\u1ec7n t\u1ee9c th\u1eddi trong m\u1ea1ch l\u00e0 i. C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n trong m\u1ea1ch dao \u0111\u1ed9ng v\u1edbi bi\u00ean \u0111\u1ed9 l\u00e0<\/p>\n

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C\u00e2u 2:<\/b>\u00a0M\u1ed9t t\u1ee5 \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n dung C = 10 \u03bcF \u0111\u01b0\u1ee3c t\u00edch \u0111i\u1ec7n \u00e1p U_{o<\/sub>\u00a0= 20 V. Sau \u0111\u1ed1 cho t\u1ee5 ph\u00f3ng \u0111i\u1ec7n qua m\u1ed9t cu\u1ed9n c\u1ea3m L = 0,01 H, \u0111i\u1ec7n tr\u1edf thu\u1ea7n kh\u00f4ng \u0111\u00e1ng k\u1ec3. (L\u1ea5y \u03c0=\u221a10). \u0110i\u1ec7n t\u00edch c\u1ee7a t\u1ee5 \u0111i\u1ec7n \u1edf th\u1eddi \u0111i\u1ec3m t1<\/sub>=2,5.10^{-4<\/sup>\u00a0s k\u1ec3 t\u1eeb l\u00fac t\u1ee5 \u0111i\u1ec7n b\u1eaft \u0111\u1ea7u ph\u00f3ng \u0111i\u1ec7n l\u00e0<\/p>\n}}

A. q=2.10^{-4<\/sup>\u00a0C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. q = 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. q=\u221a3.10-4<\/sup>\u00a0C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. q=\u221a2.10-4<\/sup>\u00a0C<\/p>\n}

C\u00e2u 3:<\/b>\u00a0M\u1ed9t t\u1ee5 \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n dung C = 0,02 \u03bcF \u0111\u01b0\u1ee3c t\u00edch \u0111i\u1ec7n \u00e1p U_{o<\/sub>\u00a0= 6 V. L\u00fac t = 0, ng\u01b0\u1eddi ta n\u1ed1i t\u1ee5 \u0111i\u1ec7n n\u00e0y v\u1edbi m\u1ed9t cu\u1ed9n c\u1ea3m thu\u1ea7n c\u00f3 \u0111\u1ed9 t\u1ef1 c\u1ea3m L = 0,2 mH. Bi\u1ec3u th\u1ee9c \u0111i\u1ec7n \u00e1p gi\u1eefa hai b\u1ea3n t\u1ee5 l\u00e0<\/p>\n}

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C\u00e2u 4:<\/b>\u00a0M\u1ed9t m\u1ea1ch dao \u0111\u1ed9ng \u0111i\u1ec7n t\u1eeb g\u1ed3m m\u1ed9t cu\u1ed9n c\u1ea3m thu\u1ea7n c\u00f3 \u0111\u1ed9 t\u1ef1 c\u1ea3m L v\u00e0 hai t\u1ef1 \u0111i\u1ec7n C_{1<\/sub>\u00a0v\u00e0 C2<\/sub>. Khi m\u1eafc cu\u1ed9n d\u00e2y ri\u00eang v\u1edbi t\u1eebng t\u1ee5 \u0111i\u1ec7n C1<\/sub>\u00a0v\u00e0 C2<\/sub>\u00a0th\u00ec chu k\u00ec dao \u0111\u1ed9ng c\u1ee7a m\u1ea1ch t\u01b0\u01a1ng \u1ee9ng l\u00e0 T1<\/sub>\u00a0= 6 ms v\u00e0 T2<\/sub>\u00a0= 8 ms. Chu k\u00ec dao \u0111\u1ed9ng c\u1ee7a m\u1ea1ch khi m\u1eafc \u0111\u1ed3ng th\u1eddi cu\u1ed9n d\u00e2y v\u1edbi t\u1ee5 \u0111i\u1ec7n C1<\/sub>\u00a0n\u1ed1i ti\u1ebfp t\u1ee5 \u0111i\u1ec7n C2<\/sub><\/p>\n}

A. 6,4 ms\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 4,6 ms\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. 4,8 ms\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 8,4 ms<\/p>\n

C\u00e2u 5:<\/b>\u00a0Khi m\u1eafc cu\u1ed9n c\u1ea3m L v\u1edbi t\u1ee5 \u0111i\u1ec7n C_{1<\/sub>\u00a0th\u00e0nh m\u1ea1ch dao \u0111\u1ed9ng th\u00ec t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng ri\u00eang c\u1ee7a m\u1ea1ch l\u00e0 f1<\/sub>, khi m\u1eafc L v\u1edbi t\u1ee5 \u0111i\u1ec7n C2<\/sub>\u00a0th\u00ec t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng ri\u00eang c\u1ee7a m\u1ea1ch l\u00e0 f2<\/sub>. Mu\u1ed1n t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng c\u1ee7a m\u1ea1ch l\u00e0 (f1<\/sub>+f2<\/sub>)\/2 th\u00ec \u0111i\u1ec7n dung c\u1ee7a t\u1ee5 \u0111i\u1ec7n trong m\u1ea1ch c\u00f3 gi\u00e1 tr\u1ecb l\u00e0<\/p>\n}

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C\u00e2u 6:<\/b>\u00a0M\u1ed9t m\u1ea1ch \u0111i\u1ec7n dao \u0111\u1ed9ng \u0111i\u1ec7n t\u1eeb l\u00ed t\u01b0\u1edfng c\u00f3 L = 5 mH ; C = 0,0318 mF. \u0110i\u1ec7n \u00e1p c\u1ef1c \u0111\u1ea1i tr\u00ean t\u1ee5 \u0111i\u1ec7n l\u00e0 8 V. Khi \u0111i\u1ec7n \u00e1p tr\u00ean t\u1ee5 \u0111i\u1ec7n l\u00e0 4 V th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n t\u1ee9c th\u1eddi trong m\u1ea1ch l\u00e0<\/p>\n

A. 0,55 A\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 0,45 A\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. 0,55 mA\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 0,45 mA<\/p>\n

C\u00e2u 7:<\/b>\u00a0M\u1ed9t m\u1ea1ch dao \u0111\u1ed9ng t\u1eeb LC l\u00ed t\u01b0\u1edfng. Khi \u0111i\u1ec7n \u00e1p gi\u1eefa hai \u0111\u1ea7u b\u1ea3n t\u1ee5 \u0111i\u1ec7n l\u00e0 2 V th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n \u0111i qua cu\u1ed9n d\u00e2y l\u00e0 i, khi \u0111i\u1ec7n \u00e1p gi\u1eefa hai \u0111\u1ea7u b\u1ea3n t\u1ee5 \u0111i\u1ec7n l\u00e0 4 V th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n qua cu\u1ed9n d\u00e2y l\u00e0 i\/2. \u0110i\u1ec7n \u00e1p c\u1ef1c \u0111\u1ea1i gi\u1eefa hai \u0111\u1ea7u cu\u1ed9n d\u00e2y l\u00e0<\/p>\n

A. 4 V\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 2\u221a5 V\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. 2\u221a3 V\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 6 V<\/p>\n

C\u00e2u 8:<\/b>\u00a0Khi m\u1eafc cu\u1ed9n c\u1ea3m L v\u1edbi t\u1ee5 \u0111i\u1ec7n C_{1<\/sub>\u00a0th\u00e0nh m\u1ea1ch dao \u0111\u1ed9ng th\u00ec t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng ri\u00eang c\u1ee7a m\u1ea1ch l\u00e0 f1<\/sub>, khi m\u1eafc L v\u1edbi t\u1ee5 \u0111i\u1ec7n C2<\/sub>\u00a0th\u00ec t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng ri\u00eang c\u1ee7a m\u1ea1ch l\u00e0 f2<\/sub>. T\u1ea7n s\u1ed1 ri\u00eang dao \u0111\u1ed9ng c\u1ee7a m\u1ea1ch khi gh\u00e9p cu\u1ed9n c\u1ea3m v\u1edbi t\u1ee5 \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n dung b\u1eb1ng C1<\/sub>+C2<\/sub>\u00a0l\u00e0<\/p>\n}

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C\u00e2u 9:<\/b>\u00a0Khi m\u1eafc t\u1ee5 \u0111i\u1ec7n C_{1<\/sub>\u00a0v\u00e0o m\u1ea1ch dao \u0111\u1ed9ng th\u00ec t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng ri\u00eang c\u1ee7a m\u1ea1ch l\u00e0 6 kHz. Khi ta thay \u0111\u1ed5i t\u1ee5 \u0111i\u1ec7n C1<\/sub>b\u1eb1ng t\u1ee5 \u0111i\u1ec7n C2<\/sub>\u00a0th\u00ec t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng c\u1ee7a m\u1ea1ch l\u00e0 8 kHz. Khi m\u1eafc t\u1ee5 \u0111i\u1ec7n C1<\/sub>\u00a0n\u1ed1i ti\u1ebfp t\u1ee5 \u0111i\u1ec7n C2<\/sub>\u00a0v\u00e0o m\u1ea1ch dao \u0111\u1ed9ng th\u00ec t\u1ea7n s\u1ed1 ri\u00eang c\u1ee7a m\u1ea1ch l\u00e0<\/p>\n}

A. 14 kHz\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 7 kHz\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. 12 kHz\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 10 kHz<\/p>\n

H\u01b0\u1edbng d\u1eabn gi\u1ea3i v\u00e0 \u0111\u00e1p \u00e1n<\/b><\/p>\n\n\n\n\n

C\u00e2u<\/td>\n	1<\/td>\n	2<\/td>\n	3<\/td>\n	4<\/td>\n	5<\/td>\n	6<\/td>\n	7<\/td>\n	8<\/td>\n	9<\/td>\n<\/tr>\n
\u0110\u00e1p \u00e1n<\/td>\n	B<\/td>\n	D<\/td>\n	A<\/td>\n	C<\/td>\n	B<\/td>\n	A<\/td>\n	B<\/td>\n	C<\/td>\n	D<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \nC\u00e2u 1:<\/b>\u00a0B<\/p>\n <\/p>\n C\u00e2u 2:<\/b>\u00a0D<\/p>\n <\/p>\n C\u00e2u 3:<\/b>\u00a0A<\/p>\n <\/p>\n C\u00e2u 4:<\/b>\u00a0C<\/p>\n <\/p>\n C\u00e2u 5:<\/b>\u00a0B<\/p>\n <\/p>\n C\u00e2u 6:<\/b>\u00a0A<\/p>\n <\/p>\n C\u00e2u 7:<\/b>\u00a0B<\/p>\n <\/p>\n C\u00e2u 8:<\/b>\u00a0C<\/p>\n <\/p>\n C\u00e2u 9:<\/b>\u00a0D<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" C\u00e2u 1:\u00a0Trong m\u1ea1ch dao \u0111\u1ed9ng \u0111i\u1ec7n t\u1eeb l\u00ed t\u01b0\u1edfng v\u1edbi t\u1ea7n s\u1ed1 g\u00f3c \u03c9. Khi \u0111i\u1ec7n t\u00edch t\u1ee9c th\u1eddi c\u1ee7a t\u1ee5 \u0111i\u1ec7n l\u00e0 q th\u00ec d\u00f2ng \u0111i\u1ec7n t\u1ee9c th\u1eddi trong m\u1ea1ch l\u00e0 i. C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n trong m\u1ea1ch dao \u0111\u1ed9ng v\u1edbi bi\u00ean \u0111\u1ed9 l\u00e0 C\u00e2u 2:\u00a0M\u1ed9t t\u1ee5 \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n dung C = 10 […]<\/p>\n","protected":false},"author":3,"featured_media":25888,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[158],"tags":[1443,1442],"yoast_head":"\n