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{"id":25940,"date":"2018-04-09T17:50:43","date_gmt":"2018-04-09T10:50:43","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=25940"},"modified":"2018-04-09T17:50:43","modified_gmt":"2018-04-09T10:50:43","slug":"bai-tap-trac-nghiem-vat-li-12-chuong-3-phan-1","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-chuong-3-phan-1\/","title":{"rendered":"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: Ch\u01b0\u01a1ng 3 (ph\u1ea7n 1)"},"content":{"rendered":"

C\u00e2u 1:<\/b>\u00a0M\u1ed9t khung d\u00e2y quay \u0111\u1ec1u trong t\u1eeb tr\u01b0\u1eddng \u0111\u1ec1u quanh tr\u1ee5c n\u1eb1m trong m\u1eb7t ph\u1eb3ng c\u1ee7a khung v\u00e0 v\u01b0\u01a1ng g\u00f3c v\u1edbi c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb. N\u1ebfu gi\u1ea3m chu k\u00ec quay \u0111i 2 l\u1ea7n v\u00e0 gi\u1ea3m \u0111\u1ed9 l\u1edbn c\u1ea3m \u1ee9ng c\u1ee7a t\u1eeb tr\u01b0\u1eddng \u0111i 3 l\u1ea7n th\u00ec su\u1ea5t \u0111i\u1ec7n \u0111\u1ed9ng hi\u1ec7u d\u1ee5ng trong khung s\u1ebd<\/p>\n

A. T\u0103ng 3 l\u1ea7m \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. T\u0103ng 1,5 l\u1ea7n<\/p>\n

C. Gi\u1ea3m 6 l\u1ea7n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. Gi\u1ea3m 1,5 l\u1ea7n<\/p>\n

C\u00e2u 2:<\/b>\u00a0N\u1ed1i hai \u0111\u1ea7u \u0111\u1ea1on m\u1ea1ch R, L, C m\u1eafc n\u1ed1i ti\u1ebfp v\u00e0o m\u1ea1ng \u0111i\u1ec7n xoay chi\u1ec1u c\u00f3 t\u1ea7n s\u1ed1 f1<\/sub>\u00a0th\u00ec c\u1ea3m kh\u00e1ng l\u00e0 15 \u03a9 v\u00e0 dung kh\u00e1ng l\u00e0 60 \u03a9. N\u1ebfu m\u1ea1ng \u0111i\u1ec7n c\u00f3 t\u1ea7n s\u1ed1 f2<\/sub>\u00a0= 50 Hz th\u00ec d\u00f2ng \u0111i\u1ec7n trong m\u1ea1ch c\u00f9ng pha v\u1edbi \u0111i\u1ec7n \u00e1p \u1edf hai \u0111\u1ea7u \u0111o\u1ea1n m\u1ea1ch. T\u1ea7n s\u1ed1 f1<\/sub>\u00a0l\u00e0<\/p>\n

A. 25 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 100 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. 150 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 200 Hz<\/p>\n

C\u00e2u 3:<\/b>\u00a0Cho \u0111o\u1ea1n m\u1ea1ch \u0111i\u1ec7n xoay chi\u1ec1u c\u00f3 R, L, C m\u1eafc n\u1ed1i ti\u1ebfp, trong \u0111\u00f3 ZC<\/sub>\u00a0bi\u1ebfn \u0111\u1ed5i \u0111\u01b0\u1ee3c. N\u1ebfu cho ZC<\/sub>\u00a0t\u0103ng th\u00eam 30 \u03a9 so v\u1edbi gi\u00e1 tr\u1ecb l\u00fac c\u00f3 c\u1ed9ng h\u01b0\u1edfng \u0111i\u1ec7n th\u00ec \u0111i\u1ec7n \u00e1p \u1edf hai \u0111\u1ea7u \u0111o\u1ea1n m\u1ea1ch l\u1ec7ch pha \u03c0\/3 so v\u1edbi d\u00f2ng \u0111i\u1ec7n trong m\u1ea1ch. \u0110i\u1ec7n tr\u1edf R c\u00f3 gi\u00e1 tr\u1ecb l\u00e0<\/p>\n

A. 15\u221a2 \u03a9 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 10\u221a3 \u03a9 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. 15\u221a3 \u03a9 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 10\u221a2 \u03a9<\/p>\n

C\u00e2u 4:<\/b>\u00a0M\u1ed9t \u0111o\u1ea1n m\u1ea1ch \u0111i\u1ec7n xoay chi\u1ec1u g\u1ed3m hai cu\u1ed9n d\u00e2y m\u1eafc n\u1ed1i ti\u1ebfp. \u0110\u1ed9 t\u1ef1 c\u1ea3m v\u00e0 \u0111i\u1ec7n tr\u1edf thu\u1ea7n c\u1ee7a hai cu\u1ed9n d\u00e2y l\u1ea7n l\u01b0\u1ee3t l\u00e0 L1<\/sub>\u00a0,r1<\/sub>\u00a0; L2<\/sub>\u00a0,r2<\/sub>. \u0110i\u1ec1u ki\u1ec7n \u0111\u1ec3 \u0111i\u1ec7n \u00e1p hi\u1ec7u d\u1ee5ng gi\u1eefa hai \u0111\u1ea7u \u0111o\u1ea1n m\u1ea1ch b\u1eb1ng t\u1ed5ng \u0111i\u1ec7n \u00e1p hi\u1ec7u d\u1ee5ng gi\u1eefa hai \u0111\u1ea7u hai cu\u1ed9n d\u00e2y l\u00e0<\/p>\n

A. L1<\/sub>\u00a0r1<\/sub>=L2<\/sub>\u00a0r2<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. L1<\/sub>r1<\/sub>2<\/sup>=L2<\/sub>r2<\/sub>2<\/sup><\/p>\n

C. L1<\/sub>\u00a0r2<\/sub>=L2<\/sub>\u00a0r1<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. L1<\/sub>r2<\/sub>2<\/sup>=L2<\/sub>r1<\/sub>2<\/sup><\/p>\n

C\u00e2u 5:<\/b>\u00a0Cho \u0111o\u1ea1n m\u1ea1ch \u0111i\u1ec7n c\u00f3 R, L, C m\u1eafc n\u1ed1i ti\u1ebfp, trong d\u1ed1 R l\u00e0 m\u1ed9t bi\u1ebfn tr\u1edf. \u0110\u1eb7t v\u00e0o hai \u0111\u1ea7u \u0111o\u1ea1n m\u1ea1ch m\u1ed9t \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u c\u00f3 \u0111i\u1ec7n \u00e1p hi\u1ec7u d\u1ee5ng l\u00e0 U = 120 V. Khi \u0111i\u1ec7n tr\u1edf bi\u1ebfn tr\u1edf b\u1eb1ng 40 \u03a9 ho\u1eb7c 160 \u03a9 th\u00ec \u0111o\u1ea1n m\u1ea1ch ti\u00eau th\u1ee5 c\u00f9ng c\u00f4ng su\u1ea5t. Khi \u0111i\u1ec1u ch\u1ec9nh bi\u1ebfn tr\u1edf, c\u00f4ng su\u1ea5t c\u1ef1c \u0111\u1ea1i m\u00e0 \u0111o\u1ea1n m\u1ea1ch c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c l\u00e0<\/p>\n

A. 180 W \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 144 W \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. 72 W \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 90 W<\/p>\n

C\u00e2u 6:<\/b>\u00a0\u0110\u1eb7t \u0111i\u1ec7n \u00e1p u=110\u221a2 cos\u03c9t (V) (v\u1edbi \u03c9 kh\u00f4ng \u0111\u1ed5i) v\u00e0o hai \u0111\u1ea7u \u0111o\u1ea1n m\u1ea1ch RLC n\u1ed1i ti\u1ebfp. Bi\u1ebft \u0111\u1ed9 t\u1ef1 c\u1ea3m v\u00e0 \u0111i\u1ec7n dung c\u1ee7a m\u1ea1ch \u0111i\u1ec7n \u0111\u01b0\u1ee3c gi\u1eef kh\u00f4ng \u0111\u1ed5i. \u0110i\u1ec1u ch\u1ec9nh R ta th\u1ea5y gi\u00e1 tr\u1ecb hi\u1ec7u d\u1ee5ng c\u1ee7a c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n trong m\u1ea1ch l\u00e0 I = 2 A th\u00ec c\u00f4ng su\u1ea5t ti\u00eau th\u1ee5 c\u1ee7a \u0111o\u1ea1n m\u1ea1ch c\u1ef1c \u0111\u1ea1i. C\u00f4ng su\u1ea5t c\u1ef1c \u0111\u1ea1i b\u1eb1ng<\/p>\n

A. 110 W \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 220 W \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. 110\u221a2 W \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 110\u221a3 W<\/p>\n

H\u01b0\u1edbng d\u1eabn gi\u1ea3i v\u00e0 \u0111\u00e1p \u00e1n<\/b><\/p>\n\n\n\n\n
C\u00e2u<\/td>\n1<\/td>\n2<\/td>\n3<\/td>\n4<\/td>\n5<\/td>\n6<\/td>\n<\/tr>\n
\u0110\u00e1p \u00e1n<\/td>\nD<\/td>\nA<\/td>\nB<\/td>\nC<\/td>\nD<\/td>\nC<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

C\u00e2u 1:<\/b>\u00a0D<\/p>\n

\"\"<\/p>\n

ta th\u1ea5y khi T gi\u1ea3m 2 l\u1ea7n, B gi\u1ea3m 3 l\u1ea7n, th\u00ec E gi\u1ea3m 1,5 l\u1ea7n.<\/p>\n

C\u00e2u 2:<\/b>\u00a0A<\/p>\n

\"\"<\/p>\n

C\u00e2u 3:<\/b>\u00a0B<\/p>\n

\"\"<\/p>\n

C\u00e2u 4:<\/b>\u00a0C<\/p>\n

\u0110\u1ec3 \u0111i\u1ec7n \u00e1p hi\u1ec7u d\u1ee5ng gi\u1eefa hai \u0111\u1ea7u \u0111o\u1ea1n m\u1ea1ch b\u1eb1ng t\u1ed5ng \u0111i\u1ec7n \u00e1p hi\u1ec7u d\u1ee5ng gi\u1eefa hai \u0111\u1ea7u cu\u1ed9n d\u00e2y ph\u1ea3i c\u00f9ng pha.<\/p>\n

\"\"<\/p>\n

C\u00e2u 5:<\/b>\u00a0D<\/p>\n

\"\"<\/p>\n

C\u00e2u 6:<\/b>\u00a0C<\/p>\n

\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00e2u 1:\u00a0M\u1ed9t khung d\u00e2y quay \u0111\u1ec1u trong t\u1eeb tr\u01b0\u1eddng \u0111\u1ec1u quanh tr\u1ee5c n\u1eb1m trong m\u1eb7t ph\u1eb3ng c\u1ee7a khung v\u00e0 v\u01b0\u01a1ng g\u00f3c v\u1edbi c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb. N\u1ebfu gi\u1ea3m chu k\u00ec quay \u0111i 2 l\u1ea7n v\u00e0 gi\u1ea3m \u0111\u1ed9 l\u1edbn c\u1ea3m \u1ee9ng c\u1ee7a t\u1eeb tr\u01b0\u1eddng \u0111i 3 l\u1ea7n th\u00ec su\u1ea5t \u0111i\u1ec7n \u0111\u1ed9ng hi\u1ec7u d\u1ee5ng trong khung s\u1ebd […]<\/p>\n","protected":false},"author":3,"featured_media":25941,"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":"\nB\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: Ch\u01b0\u01a1ng 3 (ph\u1ea7n 1)<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-chuong-3-phan-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: Ch\u01b0\u01a1ng 3 (ph\u1ea7n 1)\" \/>\n<meta property=\"og:description\" content=\"C\u00e2u 1:\u00a0M\u1ed9t khung d\u00e2y quay \u0111\u1ec1u trong t\u1eeb tr\u01b0\u1eddng \u0111\u1ec1u quanh tr\u1ee5c n\u1eb1m trong m\u1eb7t ph\u1eb3ng c\u1ee7a khung v\u00e0 v\u01b0\u01a1ng g\u00f3c v\u1edbi c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb. 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