{"id":1009,"date":"2021-10-08T13:01:10","date_gmt":"2021-10-08T13:01:10","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=1009"},"modified":"2021-10-14T22:12:11","modified_gmt":"2021-10-14T15:12:11","slug":"hien-tuong-cam-ung-dien-tu-la-gi-kien-thuc-vat-ly-9","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/hien-tuong-cam-ung-dien-tu-la-gi-kien-thuc-vat-ly-9\/","title":{"rendered":"Hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb l\u00e0 g\u00ec? Ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd 9"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">H\u1ecdc gi\u1ecfi m\u00f4n v\u1eadt l\u00fd kh\u00f4ng h\u1ec1 kh\u00f3. \u0110\u1ec3 c\u00f3 th\u1ec3 n\u1eafm ch\u1eafc \u0111\u01b0\u1ee3c nh\u1eefng c\u00f4ng th\u1ee9c ph\u1ee9c t\u1ea1p, <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> c\u1ea7n ph\u1ea3i hi\u1ec3u nh\u1eefng kh\u00e1i ni\u1ec7m, l\u00fd thuy\u1ebft tr\u01b0\u1edbc \u0111\u00e3. M\u1ed9t trong s\u1ed1 nh\u1eefng ki\u1ebfn th\u1ee9c c\u1ea7n ghi nh\u1edb ch\u00ednh l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb. \u0110\u00e2y l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng g\u00ec? Nguy\u00ean l\u00fd c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb c\u00f3 th\u00ed nghi\u1ec7m ra sao, \u1ee9ng d\u1ee5ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb nh\u01b0 th\u1ebf n\u00e0o? C\u00f9ng \u0111\u1ecdc ti\u1ebft b\u00e0i vi\u1ebft c\u1ee7a ch\u00fang t\u00f4i \u0111\u1ec3 hi\u1ec3u th\u00eam v\u1ec1 nh\u1eefng ki\u1ebfn th\u1ee9c n\u00e0y b\u1ea1n nh\u00e9. Ngo\u00e0i ra, ch\u00fang t\u00f4i c\u0169ng chia s\u1ebb m\u1ed9t s\u1ed1 b\u00e0i h\u1ecdc \u0111\u1ec3 c\u00e1c em <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng v\u00e0o. B\u1eaft \u0111\u1ea7u ngay th\u00f4i n\u00e0o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">thi-nghiem-hien-tuong-cam-ung-dien-tu<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Th\u00ed nghi\u1ec7m Faraday<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1edbc khi t\u00ecm hi\u1ec3u v\u1ec1 hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb, b\u1ea1n n\u00ean bi\u1ebft v\u1ec1 th\u00ed nghi\u1ec7m n\u00e0y tr\u01b0\u1edbc. Th\u00ed nghi\u1ec7m Faraday n\u1ed5i ti\u1ebfng \u0111\u01b0\u1ee3c cho l\u00e0 minh ch\u1ee9ng \u0111\u00fang nh\u1ea5t cho hi\u1ec7n t\u01b0\u1ee3ng tr\u00ean. \u0110\u1ea7u ti\u00ean, ta l\u1ea5y m\u1ed9t cu\u1ed9n d\u00e2y v\u00e0 m\u1eafc n\u00f3 n\u1ed1i ti\u1ebfp v\u1edbi \u0111i\u1ec7n k\u1ebf G \u0111\u1ec3 th\u00e0nh m\u1ea1ch k\u00edn. B\u00ean tr\u00ean c\u1ee7a \u1ed1ng d\u00e2y \u0111\u1eb7t m\u1ed9t thanh nam ch\u00e2m c\u00f3 hai c\u1ef1c B\u1eafc, Nam. T\u1eeb th\u00ed nghi\u1ec7m n\u00e0y ta c\u00f3 th\u1ec3 nh\u1eadn th\u1ea5y r\u1eb1ng:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu ta r\u00fat thanh nam ch\u00e2m ra, d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng s\u1ebd \u0111i theo chi\u1ec1u ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Di chuy\u1ec3n thanh nam ch\u1ea7m c\u00e0ng l\u00fac c\u00e0ng nhanh, th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng s\u1ebd c\u00e0ng l\u00fac c\u00e0ng l\u1edbn.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gi\u1eef nguy\u00ean thanh nam ch\u00e2m \u0111\u1ee9ng y\u00ean so v\u1edbi \u1ed1ng d\u00e2y. Ta th\u1ea5y r\u1eb1ng d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng \u0111i qua s\u1ebd b\u1eb1ng 0.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu ta thay nam ch\u00e2m b\u1eb1ng m\u1ed9t \u1ed1ng d\u00e2y c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua. Ta ti\u1ebfn h\u00e0nh c\u00e1c th\u00ed nghi\u1ec7m nh\u01b0 tr\u00ean, k\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c s\u1ebd l\u00e0 t\u01b0\u01a1ng t\u1ef1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">K\u1ebft lu\u1eadn c\u1ee7a Faraday<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb th\u00ed nghi\u1ec7m hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb n\u00e0y, \u00f4ng Faraday \u0111\u00e3 \u0111\u01b0a ra nh\u1eefng k\u1ebft lu\u1eadn sau:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb th\u00f4ng m\u00e0 g\u1eedi qua m\u1ea1ch k\u00edn s\u1ebd bi\u1ebfn \u0111\u1ed5i theo th\u1eddi gian. \u0110\u00e2y ch\u00ednh l\u00e0 nguy\u00ean nh\u00e2n sinh ra d\u00f2ng \u0111i\u1ec7n c\u00f3 c\u1ea3m \u1ee9ng trong m\u1ea1ch \u0111\u00f3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng s\u1ebd ch\u1ec9 t\u1ed3n t\u1ea1i \u1edf trong th\u1eddi gian m\u00e0 t\u1eeb th\u00f4ng g\u1eedi qua m\u1ea1ch k\u00edn bi\u1ebfn \u0111\u1ed5i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng s\u1ebd t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi t\u1ed1c \u0111\u1ed9 bi\u1ebfn \u0111\u1ed5i c\u1ee7a t\u1eeb th\u00f4ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i ra, chi\u1ec1u c\u1ee7a d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng c\u00f3 ph\u1ee5 thu\u1ed9c v\u00e0o t\u1eeb th\u00f4ng. C\u1ee5 th\u1ec3 l\u00e0 s\u1ef1 t\u0103ng ho\u1eb7c s\u1ef1 gi\u1ea3m c\u1ee7a t\u1eeb th\u00f4ng g\u1eedi qua m\u1ea1ch.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nguy\u00ean l\u00fd c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb l\u00e0 g\u00ec?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb th\u00ed nghi\u1ec7m tr\u00ean, nhi\u1ec1u ng\u01b0\u1eddi t\u00f2 m\u00f2 v\u1ec1 \u0111\u1ecbnh ngh\u0129a c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb. \u0110\u1ecbnh ngh\u0129a n\u00e0y kh\u00f4ng qu\u00e1 ph\u1ee9c t\u1ea1p. C\u00f3 nhi\u1ec1u c\u00e1ch \u0111\u1ec3 s\u1eed d\u1ee5ng nam ch\u00e2m v\u00e0 t\u1ea1o ra \u0111\u01b0\u1ee3c d\u00f2ng \u0111i\u1ec7n b\u00ean trong m\u1ed9t cu\u1ed9n d\u00e2y k\u00edn. D\u00f2ng \u0111i\u1ec7n m\u00e0 \u0111\u01b0\u1ee3c t\u1ea1o ra theo c\u00e1ch \u0111\u00f3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng. Th\u1ebf n\u00ean, hi\u1ec7n t\u01b0\u1ee3ng xu\u1ea5t hi\u1ec7n ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng ch\u00ednh l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb. \u0110\u00e2y l\u00e0 c\u00e2u tr\u1ea3 l\u1eddi ch\u00ednh x\u00e1c cho vi\u1ec7c hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb x\u1ea3y ra khi n\u00e0o?<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>T\u00ecm hi\u1ec3u th\u00eam v\u1ec1 \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n m\u1ed9t chi\u1ec1u<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ecbnh lu\u1eadt Lenz<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u00e2y l\u00e0 \u0111\u1ecbnh lu\u1eadt m\u1edf r\u1ed9ng, b\u00ean c\u1ea1nh nghi\u00ean c\u1ee9u m\u00e0 Faraday mang \u0111\u1ebfn. Heinrich Lenz c\u0169ng nghi\u00ean c\u1ee9u v\u1ec1 c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb v\u00e0 \u1ee9ng d\u1ee5ng hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb. \u00d4ng ph\u00e1t bi\u1ec3n nh\u01b0 sau: D\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb s\u1ebd ph\u1ea3i c\u00f3 chi\u1ec1u sao cho t\u1eeb tr\u01b0\u1eddng m\u00e0 n\u00f3 sinh ra, s\u1ebd c\u00f3 t\u00e1c d\u1ee5ng ch\u1ed1ng l\u1ea1i nguy\u00ean nh\u00e2n sinh ra n\u00f3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gi\u1ea3i th\u00edch v\u1ec1 \u0111i\u1ec1u n\u00e0y, ta c\u00f3 th\u1ec3 th\u1ea5y nh\u01b0 sau: Khi t\u1eeb th\u00f4ng \u0111i qua m\u1ea1ch t\u0103ng l\u00ean, t\u1eeb tr\u01b0\u1eddng c\u1ea3m \u1ee9ng sinh ra s\u1ebd c\u00f3 t\u00e1c d\u1ee5ng ch\u1ed1ng l\u1ea1i s\u1ef1 t\u0103ng t\u1eeb th\u00f4ng \u0111em \u0111\u1ebfn. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 t\u1eeb tr\u01b0\u1eddng c\u1ea3m \u1ee9ng ng\u01b0\u1ee3c v\u1edbi chi\u1ec1u c\u1ee7a t\u1eeb tr\u01b0\u1eddng ngo\u00e0i. Kh\u00f4ng ch\u1ec9 c\u00f3 v\u1eady, n\u1ebfu t\u1eeb th\u00f4ng \u0111i qua m\u1ea1ch gi\u1ea3m, th\u00ec t\u1eeb tr\u01b0\u1eddng c\u1ea3m \u1ee9ng m\u00e0 d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng sinh ra n\u00f3, s\u1ebd c\u00f3 t\u00e1c d\u1ee5ng ch\u1ed1ng l\u1ea1i s\u1ef1 gi\u1ea3m c\u1ee7a t\u1eeb th\u00f4ng. Khi \u0111\u00f3, t\u1eeb tr\u01b0\u1eddng c\u1ea3m \u1ee9ng s\u1ebd c\u00f3 c\u00f9ng chi\u1ec1u v\u1edbi t\u1eeb tr\u01b0\u1eddng \u1edf ngo\u00e0i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Theo \u0111\u1ecbnh lu\u1eadt Lenz, d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng l\u00fac n\u00e0o c\u0169ng s\u1ebd c\u00f3 t\u00e1c d\u1ee5ng ch\u1ed1ng l\u1ea1i s\u1ef1 d\u1ecbch chuy\u1ec3n c\u1ee7a c\u00e1c thanh nam ch\u00e2m. Th\u1ebf n\u00ean, \u0111\u1ec3 d\u1ecbch chuy\u1ec3n nam ch\u00e2m hi\u1ec7u qu\u1ea3, ta c\u1ea7n t\u1ed1n l\u1ef1c. Ch\u00ednh l\u1ef1c m\u00e0 ta \u0111\u00e3 ti\u00eau t\u1ed1n s\u1ebd chuy\u1ec3n h\u00f3a th\u00e0nh \u0111i\u1ec7n n\u0103ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\u00d4n luy\u1ec7n l\u1ea1i ki\u1ebfn th\u1ee9c v\u1ec1 d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Th\u00f4ng tin v\u1ec1 c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u1ee8ng d\u1ee5ng c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb l\u00e0 g\u00ec?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nhi\u1ec1u ng\u01b0\u1eddi mu\u1ed1n bi\u1ebft v\u1ec1 \u1ee9ng d\u1ee5ng c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb l\u00e0 g\u00ec. Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y c\u00f3 r\u1ea5t nhi\u1ec1u \u1ee9ng d\u1ee5ng. Th\u1ebf nh\u01b0ng \u1ee9ng d\u1ee5ng quan tr\u1ecdng v\u00e0 hay \u0111\u01b0\u1ee3c nh\u1eafc \u0111\u1ebfn nh\u1ea5t l\u00e0 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u. Qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 bi\u1ebfn \u0111\u1ed5i t\u1eeb c\u01a1 n\u0103ng th\u00e0nh \u0111i\u1ec7n n\u0103ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i t\u1eadp v\u1ec1 c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1ch gi\u1ea3i th\u00edch hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y nh\u01b0 th\u1ebf n\u00e0o?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ea1n n\u00ean hi\u1ec3u v\u1ec1 c\u00e1ch gi\u1ea3i th\u00edch hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb \u0111\u1ec3 c\u00f3 th\u1ec3 l\u00e0m b\u00e0i t\u1eadp nhanh ch\u00f3ng nh\u1ea5t. Khi m\u00e0 s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb \u0111i xuy\u00ean qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y d\u1eabn. Ch\u00fang s\u1ebd l\u00e0m xu\u1ea5t hi\u1ec7n ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng. B\u1edfi th\u1ebf, hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y s\u1ebd g\u1ecdi l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Th\u1ef1c t\u1ebf \u0111\u00e3 ch\u1ee9ng minh, c\u00f3 c\u00e1ch \u0111\u1ec3 thay \u0111\u1ed5i s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb \u0111i xuy\u00ean qua cu\u1ed9n d\u00e2y. Mu\u1ed1n thay \u0111\u1ed5i, ng\u01b0\u1eddi ta s\u1ebd t\u1ea1o ra s\u1ef1 chuy\u1ec3n \u0111\u1ed9ng t\u01b0\u01a1ng \u0111\u1ed1i gi\u1eefa cu\u1ed9n d\u00e2y v\u00e0 c\u1ee5c nam ch\u00e2m.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i ra, v\u1edbi c\u1ee5c nam ch\u00e2m v\u0129nh c\u1eedu, b\u1ea1n s\u1ebd th\u1ea5y s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb n\u1eb1m xung quanh n\u00f3 kh\u00f4ng \u0111\u1ed5i. Th\u1ebf nh\u01b0ng khi nam ch\u00e2m v\u00e0 cu\u1ed9n d\u00e2y d\u1eabn k\u00edn c\u00f3 chuy\u1ec3n \u0111\u1ed9ng t\u01b0\u01a1ng \u0111\u1ed1i, ta s\u1ebd th\u1ea5y kh\u00e1c. \u0110\u00f3 ch\u00ednh l\u00e0 s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb \u0111i xuy\u00ean qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y c\u00f3 thay \u0111\u1ed5i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i t\u1eadp s\u00e1ch gi\u00e1o khoa v\u1ec1 c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e2u 1: Cho hai \u0111\u00e8n Led \u0111\u01b0\u1ee3c m\u1eafc song song v\u00e0 ng\u01b0\u1ee3c chi\u1ec1u v\u00e0o hai \u0111\u1ea7u m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn v\u1edbi thanh nam ch\u00e2m v\u0129nh c\u1eedu. B\u1ed1 tr\u00ed th\u00ed nghi\u1ec7m \u0111\u1ec3 xem d\u00f2ng \u0111i\u1ec7n xu\u1ea5t hi\u1ec7n trong cu\u1ed9n d\u00e2y d\u1eabn k\u00edn khi n\u00e0o?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A Khi di chuy\u1ec3n nam ch\u00e2m l\u1ea1i g\u1ea7n ph\u00eda cu\u1ed9n d\u00e2y<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B Khi \u0111\u1eb7t nam ch\u00e2m \u0111\u1ee9ng y\u00ean \u1edf tr\u01b0\u1edbc cu\u1ed9n d\u00e2y<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C Khi \u0111\u1eb7t nam ch\u00e2m \u0111\u1ee9ng y\u00ean \u1edf b\u00ean trong cu\u1ed9n d\u00e2y<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D Khi di chuy\u1ec3n nam ch\u00e2m \u0111i ra xa cu\u1ed9n d\u00e2y<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e2u 2: V\u1edbi \u0111\u1ec1 b\u00e0i c\u00e2u 1, n\u1ebfu ta \u0111\u1ec3 nam ch\u00e2m \u0111\u1ee9ng y\u00ean, sau \u0111\u00f3 cho cu\u1ed9n d\u00e2y chuy\u1ec3n \u0111\u1ed9ng l\u1ea1i g\u1ea7n ho\u1eb7c ra xa th\u00ec cu\u1ed9n d\u00e2y \u0111\u00f3 c\u00f3 xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n kh\u00f4ng? T\u1ef1 l\u00e0m th\u00ed nghi\u1ec7m v\u00e0 d\u1ef1 \u0111o\u00e1n k\u1ebft qu\u1ea3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gi\u1ea3i b\u00e0i t\u1eadp hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e2u 1: B\u00ean trong cu\u1ed9n d\u00e2y d\u1eabn s\u1ebd xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng khi m\u00e0: ta di chuy\u1ec3n nam ch\u00e2m tr\u1edf l\u1ea1i g\u1ea7n cu\u1ed9n d\u00e2y ho\u1eb7c di chuy\u1ec3n nam ch\u00e2m ra xa so v\u1edbi cu\u1ed9n d\u00e2y.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e2u 2: V\u1edbi th\u00ed nghi\u1ec7m tr\u00ean, c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng trong cu\u1ed9n d\u00e2y c\u00f3 xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u00e0m sao \u0111\u1ec3 ghi nh\u1edb ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd 9?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ki\u1ebfn th\u1ee9c c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb ch\u1ec9 l\u00e0 m\u1ed9t ph\u1ea7n nh\u1ecf trong ch\u01b0\u01a1ng \u0111i\u1ec7n t\u1eeb h\u1ecdc. V\u1eadt l\u00fd 9 t\u1eadp trung v\u00e0o 4 ch\u01b0\u01a1ng kh\u00e1c nhau. \u0110\u00f3 l\u00e0 \u0111i\u1ec7n h\u1ecdc, \u0111i\u1ec7n t\u1eeb h\u1ecdc, quang h\u1ecdc v\u00e0 s\u1ef1 b\u1ea3o to\u00e0n v\u00e0 chuy\u1ec3n h\u00f3a n\u0103ng l\u01b0\u1ee3ng. Trong \u0111\u00f3 ch\u01b0\u01a1ng \u0111i\u1ec7n h\u1ecdc v\u00e0 \u0111i\u1ec7n t\u1eeb h\u1ecdc \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 l\u00e0 hai ch\u01b0\u01a1ng kh\u00f3 nh\u1ea5t. \u0110\u1ec3 h\u1ecdc \u0111\u01b0\u1ee3c v\u00e0 nhu\u1ea7n nhuy\u1ec5n ki\u1ebfn th\u1ee9c c\u1ee7a hai ch\u01b0\u01a1ng n\u00e0y, c\u00e1c em s\u1ebd ph\u1ea3i b\u1ecf ra r\u1ea5t nhi\u1ec1u th\u1eddi gian.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1ch \u0111\u1ec3 ghi nh\u1edb ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd 9 th\u00f4ng minh nh\u1ea5t, \u0111\u00f3 l\u00e0 s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 t\u01b0 duy. M\u00f4n v\u1eadt l\u00fd l\u00e0 m\u1ed9t m\u00f4n khoa h\u1ecdc, b\u1edfi th\u1ebf c\u00e1c ki\u1ebfn th\u1ee9c s\u1ebd li\u00ean k\u1ebft v\u1edbi nhau. N\u1ebfu c\u00e1c em mu\u1ed1n li\u00ean h\u1ec7 t\u1ea5t c\u1ea3 ki\u1ebfn th\u1ee9c, h\u00e3y t\u00f3m t\u1eaft v\u00e0 tr\u00ecnh b\u00e0y tr\u00ean m\u1ed9t trang A3. R\u1ea5t nhi\u1ec1u th\u1ebf h\u1ec7 <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> \u0111\u00e3 \u00e1p d\u1ee5ng theo c\u00e1ch n\u00e0y v\u00e0 c\u00f3 th\u1ec3 ghi nh\u1edb ki\u1ebfn th\u1ee9c r\u1ea5t chi ti\u1ebft. C\u00e1c em c\u00f3 th\u1ec3 l\u00ean tr\u00ean internet v\u00e0 tham kh\u1ea3o m\u1ed9t s\u1ed1 m\u1eabu tr\u00ean \u0111\u00f3. Nh\u01b0ng h\u00e3y t\u1ef1 bi\u1ebfn t\u1ea5u v\u00e0 vi\u1ebft theo \u00fd hi\u1ec3u c\u1ee7a m\u00ecnh. \u0110i\u1ec1u n\u00e0y s\u1ebd gi\u00fap c\u00e1c em ghi nh\u1edb ki\u1ebfn th\u1ee9c n\u1ec1n t\u1ea3ng t\u1ed1t h\u01a1n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ed9i dung hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ean \u0111\u00e2y l\u00e0 nh\u1eefng th\u00f4ng tin m\u00e0 ch\u00fang t\u00f4i mang \u0111\u1ebfn cho m\u1ecdi ng\u01b0\u1eddi v\u1ec1 hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb. \u0110\u1eb7c bi\u1ec7t \u0111\u1ed1i v\u1edbi <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> kh\u1ed1i 9, c\u00e1c em h\u00e3y ghi nh\u1edb k\u1ef9 c\u00e1ch l\u00e0m v\u00e0 n\u1ed9i dung nh\u00e9. Ch\u00fang t\u00f4i tin r\u1eb1ng v\u1edbi ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd n\u1ec1n t\u1ea3ng t\u1ed1t, c\u00e1c em s\u1ebd d\u1ec5 d\u00e0ng ti\u1ebfp thu v\u1eadt l\u00fd c\u1ea5p 3 h\u01a1n. H\u00e3y tham kh\u1ea3o b\u00e0i vi\u1ebft kh\u00e1c tr\u00ean website c\u1ee7a ch\u00fang t\u00f4i c\u00e1c b\u1ea1n nh\u00e9! V\u00ed d\u1ee5 b\u00e0i vi\u1ebft v\u1ec1 \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n m\u1ed9t chi\u1ec1u r\u1ea5t x\u1ee9ng \u0111\u00e1ng \u0111\u1ec3 b\u1ea1n tham kh\u1ea3o \u0111\u00f3.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Kh\u00e1m ph\u00e1 th\u00eam nh\u1eefng ch\u1ee7 \u0111\u1ec1 m\u1edbi<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u1ea5t d\u1eabn \u0111i\u1ec7n v\u00e0 ch\u1ea5t c\u00e1ch \u0111i\u1ec7n l\u00e0 g\u00ec? Ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd 7<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u1ee8ng d\u1ee5ng c\u1ee7a nam ch\u00e2m l\u00e0 g\u00ec b\u1ea1n c\u00f3 bi\u1ebft? Ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd 9<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n \u2013 \u0110\u1ecbnh ngh\u0129a, c\u00f4ng th\u1ee9c, ph\u00e2n lo\u1ea1i v\u00e0 \u00fd ngh<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn H\u1ecdc gi\u1ecfi m\u00f4n v\u1eadt l\u00fd kh\u00f4ng h\u1ec1 kh\u00f3. \u0110\u1ec3 c\u00f3 th\u1ec3 n\u1eafm ch\u1eafc \u0111\u01b0\u1ee3c nh\u1eefng c\u00f4ng th\u1ee9c ph\u1ee9c t\u1ea1p, h\u1ecdc sinh c\u1ea7n ph\u1ea3i hi\u1ec3u nh\u1eefng kh\u00e1i ni\u1ec7m, l\u00fd thuy\u1ebft tr\u01b0\u1edbc \u0111\u00e3. M\u1ed9t trong s\u1ed1 nh\u1eefng ki\u1ebfn th\u1ee9c c\u1ea7n ghi nh\u1edb ch\u00ednh l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb. \u0110\u00e2y [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[4,7],"tags":[],"class_list":["post-1009","post","type-post","status-publish","format-standard","hentry","category-trung-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1009","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=1009"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1009\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=1009"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=1009"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=1009"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}