{"segment":[{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0o d\u01b0\u1edbi \u0111\u00e2y, trong cu\u1ed9n d\u00e2y d\u1eabn k\u00edn xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng ?","select":["A. S\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y d\u1eabn k\u00edn l\u1edbn.","B. S\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y d\u1eabn k\u00edn \u0111\u01b0\u1ee3c gi\u1eef kh\u00f4ng thay \u0111\u1ed5i.","C. S\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y d\u1eabn k\u00edn thay \u0111\u1ed5i.","D. T\u1eeb tr\u01b0\u1eddng xuy\u00ean qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y d\u1eabn k\u00edn m\u1ea1nh."],"hint":"","explain":"<span class='basic_left'>D\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng xu\u1ea5t hi\u1ec7n trong m\u1ed9t d\u00e2y d\u1eabn k\u00edn \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng c\u1ee7a m\u1ed9t nam ch\u00e2m khi s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y \u0111\u00f3 bi\u1ebfn thi\u00ean.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3251},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"V\u1edbi \u0111i\u1ec1u ki\u1ec7n n\u00e0o th\u00ec xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn?","select":["A. Khi s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n cu\u1ed9n d\u00e2y r\u1ea5t l\u1edbn.","B. Khi s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n cu\u1ed9n d\u00e2y \u0111\u01b0\u1ee3c gi\u1eef kh\u00f4ng t\u0103ng.","C. Khi kh\u00f4ng c\u00f3 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb n\u00e0o xuy\u00ean qua ti\u1ebft di\u1ec7n cu\u1ed9n d\u00e2y.","D. Khi s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n cu\u1ed9n d\u00e2y bi\u1ebfn thi\u00ean."],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec1u ki\u1ec7n xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng:<br\/>D\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng xu\u1ea5t hi\u1ec7n trong m\u1ed9t d\u00e2y d\u1eabn k\u00edn \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng c\u1ee7a m\u1ed9t nam ch\u00e2m khi s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y \u0111\u00f3 bi\u1ebfn thi\u00ean.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3252},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai32/lv2/img\/h3.jpg'\/><\/center>Tr\u00ean h\u00ecnh 32.2, thanh nam ch\u00e2m chuy\u1ec3n \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o th\u00ec kh\u00f4ng t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong cu\u1ed9n d\u00e2y?","select":["A. Chuy\u1ec3n \u0111\u1ed9ng t\u1eeb ngo\u00e0i v\u00e0o trong \u1ed1ng d\u00e2y.","B. Quay quanh tr\u1ee5c AB.","C. Quay quanh tr\u1ee5c CD.","D. Quay quanh tr\u1ee5c PQ."],"hint":"","explain":"<span class='basic_left'>V\u00ec khi quay quanh tr\u1ee5c PQ th\u00ec s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb \u0111i v\u00e0o \u1ed1ng d\u00e2y l\u00e0 kh\u00f4ng thay \u0111\u1ed5i n\u00ean kh\u00f4ng xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3253},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai32/lv2/img\/h4.jpg'\/><\/center>Tr\u00ean h\u00ecnh 32.3, khi cho khung d\u00e2y quay quanh tr\u1ee5c PQ th\u00ec trong khung d\u00e2y c\u00f3 xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng hay kh\u00f4ng? ","select":["A. C\u00f3","B. Kh\u00f4ng","C. D\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng ng\u00e0y c\u00e0ng t\u0103ng","D. Xu\u1ea5t hi\u1ec7n sau \u0111\u00f3 t\u1eaft ngay"],"hint":"","explain":"<span class='basic_left'>Kh\u00f4ng xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng.<br\/> V\u00ec s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n khung d\u00e2y kh\u00f4ng bi\u1ebfn thi\u00ean.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3254},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng:<br\/>D\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng ch\u1ec9 xu\u1ea5t hi\u1ec7n trong cu\u1ed9n d\u00e2y d\u1eabn k\u00edn trong th\u1eddi gian c\u00f3 s\u1ef1\u2026..qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y.","select":["A. Bi\u1ebfn \u0111\u1ed5i c\u1ee7a c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ","B. Bi\u1ebfn \u0111\u1ed5i c\u1ee7a th\u1eddi gian ","C. Bi\u1ebfn \u0111\u1ed5i c\u1ee7a d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng","D. Bi\u1ebfn \u0111\u1ed5i c\u1ee7a s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb"],"hint":"","explain":"<span class='basic_left'>D\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng ch\u1ec9 xu\u1ea5t hi\u1ec7n trong cu\u1ed9n d\u00e2y d\u1eabn k\u00edn trong th\u1eddi gian c\u00f3 s\u1ef1 (Bi\u1ebfn \u0111\u1ed5i c\u1ee7a s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb) qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3255},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng:<br\/>Khi s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y d\u1eabn k\u00edn bi\u1ebfn \u0111\u1ed5i th\u00ec trong cu\u1ed9n d\u00e2y d\u1eabn xu\u1ea5t hi\u1ec7n \u2026.","select":["A. D\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng","B. D\u00f2ng \u0111i\u1ec7n kh\u00f4ng \u0111\u1ed5i","C. L\u1ef1c \u0111i\u1ec7n t\u1eeb","D. L\u1ef1c t\u1eeb"],"hint":"","explain":"<span class='basic_left'>Khi s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y d\u1eabn k\u00edn bi\u1ebfn \u0111\u1ed5i th\u00ec trong cu\u1ed9n d\u00e2y d\u1eabn xu\u1ea5t hi\u1ec7n l\u1ef1c t\u1eeb<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3256},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"V\u00ec sao khi cho nam ch\u00e2m quay tr\u01b0\u1edbc m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn th\u00ec trong cu\u1ed9n d\u00e2y xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng?","select":["A. V\u00ec c\u00f3 s\u1ef1 bi\u1ebfn \u0111\u1ed5i c\u1ee7a s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb.","B. V\u00ec c\u00f3 s\u1ef1 bi\u1ebfn \u0111\u1ed5i c\u1ee7a c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n.","C. V\u00ec c\u00f3 s\u1ef1 bi\u1ebfn \u0111\u1ed5i c\u1ee7a l\u1ef1c t\u1eeb.","D. V\u00ec c\u00f3 s\u1ef1 bi\u1ebfn \u0111\u1ed5i c\u1ee7a d\u00f2ng \u0111i\u1ec7n."],"hint":"","explain":"<span class='basic_left'>Khi cho nam ch\u00e2m quay tr\u01b0\u1edbc m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn th\u00ec trong cu\u1ed9n d\u00e2y xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng v\u00ec c\u00f3 s\u1ef1 bi\u1ebfn \u0111\u1ed5i c\u1ee7a s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3257},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng:<br\/>\u0110i\u1ec1u ki\u1ec7n xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn l\u00e0 c\u00f3 chuy\u1ec3n \u0111\u1ed9ng t\u01b0\u01a1ng \u0111\u1ed1i gi\u1eefa\u2026\u2026..","select":["A. Nam ch\u00e2m v\u00e0 cu\u1ed9n d\u00e2y.","B. Nam ch\u00e2m v\u00e0 trong l\u00f2ng cu\u1ed9n d\u00e2y.","C. Nam ch\u00e2m v\u00e0 \u0111o\u1ea1n d\u00e2y.","D. Cu\u1ed9n d\u00e2y v\u1edbi m\u1eb7t ph\u1eb3ng t\u1ea1o b\u1edfi v\u00f2ng d\u00e2y."],"hint":"","explain":"<span class='basic_left'>V\u00ec c\u00f3 tr\u01b0\u1eddng h\u1ee3p chuy\u1ec3n \u0111\u1ed9ng gi\u1eefa nam ch\u00e2m v\u00e0 cu\u1ed9n d\u00e2y c\u0169ng kh\u00f4ng sinh ra s\u1ee9c \u0111i\u1ec7n \u0111\u1ed9ng c\u1ea3m \u1ee9ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3258},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"C\u00e1ch n\u00e0o d\u01b0\u1edbi \u0111\u00e2y c\u00f3 th\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng?","select":["A. N\u1ed1i hai c\u1ef1c c\u1ee7a pin v\u00e0o hai \u0111\u1ea7u cu\u1ed9n d\u00e2y d\u1eabn.","B. N\u1ed1i hai c\u1ef1c c\u1ee7a nam ch\u00e2m v\u1edbi hai \u0111\u1ea7u cu\u1ed9n d\u00e2y d\u1eabn.","C. \u0110\u01b0a m\u1ed9t c\u1ef1c c\u1ee7a nam ch\u00e2m t\u1eeb ngo\u00e0i v\u00e0o trong cu\u1ed9n d\u00e2y d\u1eabn k\u00edn c\u00f3 d\u00f2ng \u0111i\u1ec7n.","D. \u0110\u01b0a m\u1ed9t c\u1ef1c pin t\u1eeb ngo\u00e0i v\u00e0o trong m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn."],"hint":"","explain":"<span class='basic_left'>\u0110\u01b0a m\u1ed9t c\u1ef1c c\u1ee7a nam ch\u00e2m t\u1eeb ngo\u00e0i v\u00e0o trong cu\u1ed9n d\u00e2y d\u1eabn k\u00edn c\u00f3 d\u00f2ng \u0111i\u1ec7n c\u00f3 th\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3259},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Khi cho thanh nam ch\u00e2m chuy\u1ec3n \u0111\u1ed9ng l\u1ea1i g\u1ea7n \u1ed1ng d\u00e2y k\u00edn, d\u00f2ng \u0111i\u1ec7n trong \u1ed1ng d\u00e2y c\u00f3 g\u00ec kh\u00e1c v\u1edbi tr\u01b0\u1eddng h\u1ee3p cho thanh nam ch\u00e2m chuy\u1ec3n \u0111\u1ed9ng ra xa \u1ed1ng d\u00e2y?","select":["A. Kh\u00f4ng thay \u0111\u1ed5i.","B. \u0110\u1ed5i chi\u1ec1u.","C. Thay \u0111\u1ed5i c\u01b0\u1eddng \u0111\u1ed9.","D. C\u1ea3 B v\u00e0 C \u0111\u1ec1u \u0111\u00fang."],"hint":"","explain":"<span class='basic_left'>Khi cho thanh nam ch\u00e2m chuy\u1ec3n \u0111\u1ed9ng l\u1ea1i g\u1ea7n v\u00e0 ra xa \u1ed1ng d\u00e2y th\u00ec d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng sinh ra kh\u00e1c nhau v\u1ec1 chi\u1ec1u l\u1eabn \u0111\u1ed9 l\u1edbn.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3260},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"\u0110\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng ng\u01b0\u1eddi ta d\u00f9ng c\u00e1c c\u00e1ch sau, c\u00e1ch n\u00e0o l\u00e0 \u0111\u00fang?","select":["A. \u0110\u01b0a c\u1ef1c nam ch\u00e2m l\u1ea1i g\u1ea7n \u1ed1ng d\u00e2y.","B. \u0110\u01b0a c\u1ef1c nam ch\u00e2m ra xa \u1ed1ng d\u00e2y.","C. Quay nam ch\u00e2m xung quanh 1 tr\u1ee5c th\u1eb3ng \u0111\u1ee9ng.","D. C\u1ea3 ba c\u00e1ch \u0111\u1ec1u \u0111\u00fang."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng ng\u01b0\u1eddi ta d\u00f9ng c\u1ea3 ba c\u00e1ch tr\u00ean.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3261},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Trong c\u00e1c th\u00ed nghi\u1ec7m sau \u0111\u00e2y khi n\u00e0o kh\u00f4ng l\u00e0m thay \u0111\u1ed5i s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y:","select":["A. \u0110\u01b0a c\u1ef1c nam ch\u00e2m l\u1ea1i g\u1ea7n, ra xa \u1ed1ng d\u00e2y.","B. \u0110\u01b0a \u1ed1ng d\u00e2y l\u1ea1i g\u1ea7n, ra xa c\u1ef1c nam ch\u00e2m.","C. Quay \u1ed1ng d\u00e2y xung quah tr\u1ee5c vu\u00f4ng g\u00f3c v\u1edbi \u1ed1ng d\u00e2y.","D. Quay \u1ed1ng d\u00e2y xung quanh 1 tr\u1ee5c tr\u00f9ng v\u1edbi tr\u1ee5c \u1ed1ng d\u00e2y \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng."],"hint":"","explain":"<span class='basic_left'>Khi quay \u1ed1ng d\u00e2y xung quanh m\u1ed9t tr\u1ee5c tr\u00f9ng v\u1edbi tr\u1ee5c c\u1ee7a \u1ed1ng d\u00e2y th\u00ec s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb qua \u1ed1ng d\u00e2y kh\u00f4ng \u0111\u1ed5i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3262},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"\u0110\u1eb7t m\u1ed9t nam ch\u00e2m \u0111i\u1ec7n n\u1eb1m y\u00ean tr\u01b0\u1edbc cu\u1ed9n d\u00e2y k\u00edn. C\u00f3 hi\u1ec7n t\u01b0\u1ee3ng g\u00ec x\u1ea3y ra trong cu\u1ed9n d\u00e2y k\u00edn khi \u0111\u00f3ng v\u00e0 ng\u1eaft m\u1ea1ch c\u1ee7a nam ch\u00e2m \u0111i\u1ec7n li\u00ean t\u1ee5c?","select":["A. Kh\u00f4ng c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng g\u00ec.","B. Xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng kh\u00f4ng \u0111\u1ed5i chi\u1ec1u.","C. Xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng lu\u00f4n \u0111\u1ed5i chi\u1ec1u.","D. C\u1ea3 A, B v\u00e0 C \u0111\u1ec1u \u0111\u00fang."],"hint":"","explain":"<span class='basic_left'>Khi \u0111\u00f3ng ng\u1eaft v\u00e0 ng\u1eaft m\u1ea1ch c\u1ee7a nam ch\u00e2m \u0111i\u1ec7n li\u00ean t\u1ee5c th\u00ec t\u1eeb tr\u01b0\u1eddng qua cu\u1ed9n d\u00e2y thay \u0111\u1ed5i li\u00ean t\u1ee5c n\u00ean trong cu\u1ed9n d\u00e2y k\u00edn xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng lu\u00f4n \u0111\u1ed5i chi\u1ec1u.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3263},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0o d\u01b0\u1edbi \u0111\u00e2y, trong cu\u1ed9n d\u00e2y d\u1eabn k\u00edn xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng?","select":["A. S\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft \u0111i\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y d\u1eabn k\u00edn l\u1edbn.","B. S\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y d\u1eabn k\u00edn \u0111\u01b0\u1ee3c gi\u1eef kh\u00f4ng thay \u0111\u1ed5i.","C. S\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y d\u1eabn k\u00edn thay \u0111\u1ed5i.","D. T\u1eeb tr\u01b0\u1eddng xuy\u00ean qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y d\u1eabn k\u00edn thay \u0111\u1ed5i."],"hint":"","explain":"<span class='basic_left'>Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y d\u1eabn k\u00edn thay \u0111\u1ed5i th\u00ec trong cu\u1ed9n d\u00e2y d\u1eabn k\u00edn xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3264},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai32/lv2/img\/h15.jpg'\/><\/center>Trong c\u00e1c c\u00e1ch sau \u0111\u00e2y d\u00f9ng nam ch\u00e2m \u0111i\u1ec7n \u0111\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng (h\u00ecnh v\u1ebd) c\u00e1ch n\u00e0o \u0111\u00fang?","select":["A. D\u1ecbch chuy\u1ec3n con ch\u1ea1y c\u1ee7a bi\u1ebfn tr\u1edf R.","B. \u0110\u00f3ng ng\u1eaft \u0111i\u1ec7n K.","C. Ng\u1eaft \u0111i\u1ec7n K \u0111ang \u0111\u00f3ng, m\u1edf ng\u1eaft K","D. C\u1ea3 ba c\u00e1ch tr\u00ean \u0111\u1ec1u \u0111\u00fang"],"hint":"","explain":"<span class='basic_left'>D\u00f9ng nam ch\u00e2m \u0111i\u1ec7n \u0111\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng b\u1eb1ng c\u1ea3 ba c\u00e1ch tr\u00ean \u0111\u1ec1u \u0111\u00fang<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3265},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Tr\u01b0\u1eddng h\u1ee3p n\u00e0o sau \u0111\u00e2y d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong cu\u1ed9n d\u00e2y d\u1eabn k\u00edn kh\u00f4ng \u0111\u1ed5i chi\u1ec1u? S\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y d\u1eabn k\u00edn.","select":["A. \u0110ang t\u0103ng m\u00e0 gi\u1ea3m.","B. \u0110ang gi\u1ea3m m\u00e0 t\u0103ng.","C. \u0110ang t\u0103ng m\u00e0 t\u0103ng h\u01a1n n\u1eefa.","D. Tr\u01b0\u1eddng h\u1ee3p A v\u00e0 B l\u00e0 \u0111\u00fang."],"hint":"","explain":"<span class='basic_left'>Khi s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb \u0111i xuy\u00ean qua \u1ed1ng d\u00e2y \u0111ang t\u0103ng m\u00e0 t\u0103ng h\u01a1n n\u1eefa. Tr\u01b0\u1eddng h\u1ee3p n\u00e0y d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng c\u00f3 xu\u1ea5t hi\u1ec7n nh\u01b0ng d\u00f2ng \u0111i\u1ec7n kh\u00f4ng \u0111\u1ed5i chi\u1ec1u.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3266},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Khi \u0111\u01b0a \u0111\u1ea7u \u1ed1ng d\u00e2y k\u00edn l\u1ea1i g\u1ea7n c\u1ef1c B\u1eafc c\u1ee7a nam ch\u00e2m c\u1ed1 \u0111\u1ecbnh th\u00ec s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n \u1ed1ng d\u00e2y bi\u1ebfn thi\u00ean nh\u01b0 th\u1ebf n\u00e0o?","select":["A. T\u0103ng ","B. Gi\u1ea3m ","C. Kh\u00f4ng thay \u0111\u1ed5i","D. Kh\u00f4ng x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c."],"hint":"","explain":"<span class='basic_left'>Khi \u0111\u01b0a \u0111\u1ea7u \u1ed1ng d\u00e2y k\u00edn l\u1ea1i g\u1ea7n c\u1ef1c B\u1eafc c\u1ee7a nam ch\u00e2m c\u1ed1 \u0111\u1ecbnh th\u00ec s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n \u1ed1ng d\u00e2y t\u0103ng l\u00ean.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3267},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang khi n\u00f3i v\u1ec1 \u0111i\u1ec1u ki\u1ec7n xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn?","select":["A. \u0110\u1eb7t cu\u1ed9n d\u00e2y g\u1ea7n m\u1ed9t nam ch\u00e2m m\u1ea1nh.","B. \u0110\u1eb7t m\u1ed9t nam ch\u00e2m m\u1ea1nh trong l\u00f2ng cu\u1ed9n d\u00e2y.","C. Khi s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua l\u00f2ng cu\u1ed9n d\u00e2y r\u1ea5t l\u1edbn.","D. Khi s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y bi\u1ebfn thi\u00ean."],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec1u ki\u1ec7n xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn l\u00e0: <br\/> Khi s\u1ed1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb xuy\u00ean qua ti\u1ebft di\u1ec7n S c\u1ee7a cu\u1ed9n d\u00e2y bi\u1ebfn thi\u00ean<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3268},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Khi n\u00e0o xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong cu\u1ed9n d\u00e2y d\u1eabn k\u00edn?","select":["A. Khi cu\u1ed9n d\u00e2y chuy\u1ec3n \u0111\u1ed9ng l\u1ea1i g\u1ea7n thanh nam ch\u00e2m.","B. Khi thanh nam ch\u00e2m chuy\u1ec3n \u0111\u1ed9ng ra xa cu\u1ed9n d\u00e2y.","C. Khi thanh nam ch\u00e2m chuy\u1ec3n \u0111\u1ed9ng l\u1ea1i g\u1ea7n cu\u1ed9n d\u00e2y.","D. C\u1ea3 A, B v\u00e0 C \u0111\u1ec1u \u0111\u00fang."],"hint":"","explain":"<span class='basic_left'>Xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong cu\u1ed9n d\u00e2y d\u1eabn k\u00edn trong c\u1ea3 3 tr\u01b0\u1eddng h\u1ee3p tr\u00ean.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3269},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Tr\u01b0\u1eddng h\u1ee3p n\u00e0o xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong cu\u1ed9n d\u00e2y d\u1eabn k\u00edn?","select":["A. Cho thanh nam ch\u00e2m \u0111\u1ee9ng y\u00ean tr\u01b0\u1edbc cu\u1ed9n d\u00e2y.","B. Cho cu\u1ed9n d\u00e2y \u0111\u1ee9ng y\u00ean tr\u01b0\u1edbc thanh nam ch\u00e2m.","C. Cho cu\u1ed9n d\u00e2y chuy\u1ec3n \u0111\u1ed9ng l\u1ea1i g\u1ea7n thanh nam ch\u00e2m.","D. Khi gi\u1eef cho t\u1eeb tr\u01b0\u1eddng xuy\u00ean qua ti\u1ebft di\u1ec7n c\u1ee7a cu\u1ed9n d\u00e2y d\u1eabn k\u00edn kh\u00f4ng thay \u0111\u1ed5i."],"hint":"","explain":"<span class='basic_left'>Xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong cu\u1ed9n d\u00e2y d\u1eabn k\u00edn khi cho cu\u1ed9n d\u00e2y chuy\u1ec3n \u0111\u1ed9ng l\u1ea1i g\u1ea7n thanh nam ch\u00e2m.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3270}],"lesson":{"save":0,"level":2}}