{"segment":[{"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":"C\u00e1ch l\u00e0m 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 acquy t\u1eeb ngo\u00e0i v\u00e0o trong m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn.","D. \u0110\u01b0a m\u1ed9t c\u1ef1c c\u1ee7a nam ch\u00e2m t\u1eeb ngo\u00e0i v\u00e0o trong m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn."],"hint":"","explain":"<span class='basic_left'>C\u00e1ch l\u00e0m c\u00f3 th\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng \u0111\u01b0a m\u1ed9t c\u1ef1c c\u1ee7a nam ch\u00e2m t\u1eeb ngo\u00e0i v\u00e0o trong m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn v\u00ec khi \u0111\u00f3 t\u1eeb tr\u01b0\u1eddng c\u1ee7a nam ch\u00e2m thay \u0111\u1ed5i v\u1ec1 c\u01b0\u1eddng \u0111\u1ed9 v\u00e0 \u0111\u1ed9 l\u1edbn \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb t\u00e1c d\u1ee5ng l\u00ean v\u00f2ng d\u00e2y d\u1eabn k\u00edn t\u1ea1i ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong v\u00f2ng d\u00e2y<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3231},{"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":"C\u00e1ch n\u00e0o d\u01b0\u1edbi \u0111\u00e2y kh\u00f4ng t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn? ","select":["A. Cho cu\u1ed9n d\u00e2y d\u1eabn chuy\u1ec3n \u0111\u1ed9ng theo ph\u01b0\u01a1ng song song v\u1edbi c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb gi\u1eefa hai nh\u00e1nh c\u1ee7a nam ch\u00e2m ch\u1eef U.","B. Cho cu\u1ed9n d\u00e2y d\u1eabn quay c\u1eaft c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb c\u1ee7a nam ch\u00e2m ch\u1eef U.","C. Cho m\u1ed9t \u0111\u1ea7u c\u1ee7a nam ch\u00e2m \u0111i\u1ec7n chuy\u1ec3n \u0111\u1ed9ng l\u1ea1i g\u1ea7n m\u1ed9t \u0111\u1ea7u cu\u1ed9n d\u00e2y d\u1eabn.","D. \u0110\u1eb7t nam ch\u00e2m \u0111i\u1ec7n \u1edf tr\u01b0\u1edbc \u0111\u1ea7u cu\u1ed9n d\u00e2y r\u1ed3i ng\u1eaft m\u1ea1ch \u0111i\u1ec7n c\u1ee7a nam ch\u00e2m."],"hint":"","explain":"<span class='basic_left'>C\u00e1ch kh\u00f4ng t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn: Cho cu\u1ed9n d\u00e2y d\u1eabn chuy\u1ec3n \u0111\u1ed9ng theo ph\u01b0\u01a1ng song song v\u1edbi c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb gi\u1eefa hai nh\u00e1nh c\u1ee7a nam ch\u00e2m ch\u1eef U khi \u0111\u00f3 l\u1ef1c \u0111i\u1ec7n t\u1eeb c\u1ee7a nam ch\u00e2m kh\u00f4ng t\u00e1c d\u1ee5ng l\u00ean cu\u1ed9n d\u00e2y d\u1eabn k\u00edn.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3232},{"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":"L\u00e0m c\u00e1ch n\u00e0o \u0111\u1ec3 t\u1ea1o ra \u0111\u01b0\u1ee3c d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong \u0111inam\u00f4 xe \u0111\u1ea1p?","select":["A. N\u1ed1i hai \u0111\u1ea7u c\u1ee7a \u0111inom\u00f4 v\u1edbi hai c\u1ef1c c\u1ee7a acquy.","B. Cho b\u00e1nh xe c\u1ecd x\u00e1t m\u1ea1nh v\u00e0o n\u00fam \u0111inam\u00f4.","C. L\u00e0m cho nam ch\u00e2m trong \u0111inam\u00f4 quay tr\u01b0\u1edbc cu\u1ed9n d\u00e2y.","D. Cho xe \u0111\u1ea1p ch\u1ea1y nhanh tr\u00ean \u0111\u01b0\u1eddng."],"hint":"","explain":"<span class='basic_left'>C\u00e1ch \u0111\u1ec3 t\u1ea1o ra \u0111\u01b0\u1ee3c d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong \u0111inam\u00f4 xe \u0111\u1ea1p: L\u00e0m cho nam ch\u00e2m trong \u0111inam\u00f4 quay tr\u01b0\u1edbc cu\u1ed9n d\u00e2y khi \u0111\u00f3 nam ch\u00e2m quay c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb thay \u0111\u1ed5i t\u00e1c d\u1ee5ng l\u1ef1c t\u1eeb l\u00ean v\u00f2ng d\u00e2y d\u1eabn k\u00edn 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":3233},{"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 hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb ta nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c \u0111i\u1ec1u g\u00ec?","select":["A. D\u00f2ng \u0111i\u1ec7n xu\u1ea5t hi\u1ec7n trong cu\u1ed9n d\u00e2y d\u1eabn \u0111\u1eb7t g\u1ea7n nam ch\u00e2m?","B. D\u00f2ng \u0111i\u1ec7n xu\u1ea5t hi\u1ec7n trong cu\u1ed9n d\u00e2y \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng c\u1ee7a nam ch\u00e2m.","C. D\u00f2ng \u0111i\u1ec7n xu\u1ea5t hi\u1ec7n khi m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn quay trong t\u1eeb tr\u01b0\u1eddng c\u1ee7a nam ch\u00e2m.","D. D\u00f2ng \u0111i\u1ec7n xu\u1ea5t hi\u1ec7n trong cu\u1ed9n d\u00e2y khi cu\u1ed9n d\u00e2y ch\u1ea1m v\u00e0o nam ch\u00e2m."],"hint":"","explain":"<span class='basic_left'>Trong hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb ta nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c: D\u00f2ng \u0111i\u1ec7n xu\u1ea5t hi\u1ec7n khi m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn quay trong t\u1eeb tr\u01b0\u1eddng c\u1ee7a nam ch\u00e2m.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3234},{"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":"C\u00e1ch n\u00e0o d\u01b0\u1edbi \u0111\u00e2y c\u00f3 th\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn?","select":["A. M\u1eafc xen v\u00e0o cu\u1ed9n d\u00e2y d\u1eabn m\u1ed9t chi\u1ebfc pin.","B. D\u00f9ng m\u1ed9t nam ch\u00e2m m\u1ea1nh \u0111\u1eb7t g\u1ea7n \u0111\u1ea7u cu\u1ed9n d\u00e2y.","C. Cho m\u1ed9t c\u1ef1c c\u1ee7a nam ch\u00e2m ch\u1ea1m v\u00e0o cu\u1ed9n d\u00e2y d\u1eabn.","D. \u0110\u01b0a m\u1ed9t c\u1ef1c c\u1ee7a thanh nam ch\u00e2m t\u1eeb ngo\u00e0i v\u00e0o trong cu\u1ed9n d\u00e2y."],"hint":"","explain":"<span class='basic_left'>C\u00f3 th\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn b\u1eb1ng c\u00e1ch: <br\/>\u0110\u01b0a m\u1ed9t c\u1ef1c c\u1ee7a thanh nam ch\u00e2m t\u1eeb ngo\u00e0i v\u00e0o trong 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":3235},{"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/bai31/lv2/img\/h6.jpg'\/><\/center>M\u1ed9t \u1ed1ng d\u00e2y d\u1eabn \u0111\u01b0\u1ee3c m\u1eafc v\u1edbi \u0111i\u1ec7n k\u1ebf G \u0111\u1ec3 nh\u1eadn bi\u1ebft d\u00f2ng \u0111i\u1ec7n v\u00e0 m\u1ed9t thanh nam ch\u00e2m. Trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p n\u00e0o sau \u0111\u00e2y, kim \u0111i\u1ec7n k\u1ebf G b\u1ecb l\u1ec7ch ?","select":["A. \u0110\u01b0a thanh nam ch\u00e2m v\u00e0o trong l\u00f2ng \u1ed1ng d\u00e2y (2). ","B. \u0110\u01b0a thanh nam ch\u00e2m trong l\u00f2ng \u1ed1ng d\u00e2y ra (3).","C. \u0110\u1ec3 y\u00ean thanh nam ch\u00e2m \u1edf s\u00e1t \u0111\u1ea7u tr\u00ean \u1ed1ng d\u00e2y (1).","D. (2) v\u00e0 (3) \u0111\u00fang."],"hint":"","explain":"<span class='basic_left'>\u0110\u01b0a thanh nam ch\u00e2m v\u00e0o trong l\u00f2ng \u1ed1ng d\u00e2y ho\u1eb7c \u0111\u01b0a thanh nam ch\u00e2m trong l\u00f2ng \u1ed1ng d\u00e2y ra \u0111\u1ec1u l\u00e0m thay \u0111\u1ed5i t\u1eeb tr\u01b0\u1eddng qua \u1ed1ng d\u00e2y d\u1eabn \u0111\u1ebfn kim \u0111i\u1ec7n k\u1ebf G b\u1ecb l\u1ec7ch. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3236},{"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/bai31/lv2/img\/h7.jpg'\/><\/center>H\u00ecnh v\u1ebd sau cho th\u1ea5y kh\u00f4ng c\u00f3 d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng trong d\u00e2y d\u1eabn (Kim ampe k\u1ebf kh\u00f4ng b\u1ecb l\u1ec7ch). M\u0169i t\u00ean cho bi\u1ebft chi\u1ec1u d\u1ecbch chuy\u1ec3n c\u1ee7a thanh nam ch\u00e2m. H\u00e3y ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0111\u00fang ?","select":["A. H\u00ecnh a v\u1ebd sai, h\u00ecnh b v\u1ebd \u0111\u00fang. ","B. C\u1ea3 hai h\u00ecnh \u0111\u1ec1u v\u1ebd sai.","C. H\u00ecnh a v\u1ebd \u0111\u00fang, h\u00ecnh b v\u1ebd \u0111\u00fang.","D. H\u00ecnh a v\u1ebd \u0111\u00fang, h\u00ecnh b v\u1ebd sai."],"hint":"","explain":"<span class='basic_left'>\u0110\u01b0a thanh nam ch\u00e2m v\u00e0o trong l\u00f2ng \u1ed1ng d\u00e2y ho\u1eb7c \u0111\u01b0a thanh nam ch\u00e2m trong l\u00f2ng \u1ed1ng d\u00e2y ra \u0111\u1ec1u l\u00e0m thay \u0111\u1ed5i t\u1eeb tr\u01b0\u1eddng qua \u1ed1ng d\u00e2y d\u1eabn \u0111\u1ebfn kim ampe k\u1ebf A \u0111\u1ec1u b\u1ecb l\u1ec7ch. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3237},{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai31/lv2/img\/h8.jpg'\/><\/center>\u0110\u1eb7t m\u1ed9t khung d\u00e2y k\u00edn h\u00ecnh ch\u1eef nh\u1eadt ABCD trong t\u1eeb tr\u01b0\u1eddng \u0111\u1ec1u nh\u01b0 h\u00ecnh v\u1ebd. H\u00e3y cho bi\u1ebft th\u00f4ng tin n\u00e0o sau \u0111\u00e2y l\u00e0 sai ?","select":["A. Quay khung d\u00e2y quanh tr\u1ee5c tr\u00f9ng v\u1edbi c\u1ea1nh BC th\u00ec trong khung d\u00e2y xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng.","B. Quay khung d\u00e2y quanh tr\u1ee5c tr\u00f9ng v\u1edbi c\u1ea1nh AD th\u00ec trong khung d\u00e2y xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng.","C. D\u1ecbch chuy\u1ec3n khung d\u00e2y theo ph\u01b0\u01a1ng song song v\u1edbi c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb th\u00ec trong khung d\u00e2y xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng.","D. B\u00f3p m\u00e9o khung d\u00e2y th\u00ec trong th\u1eddi gian khung d\u00e2y b\u1ecb b\u00f3p m\u00e9o, trong khung d\u00e2y xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng."],"hint":"","explain":"<span class='basic_left'>D\u1ecbch chuy\u1ec3n khung d\u00e2y theo ph\u01b0\u01a1ng song song v\u1edbi c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb th\u00ec kh\u00f4ng l\u00e0m thay \u0111\u1ed5i c\u1ea3m \u1ee9ng t\u1eeb qua khung d\u00e2y n\u00ean kh\u00f4ng g\u00e2y ra d\u00f2ng \u0111i\u1ec7n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3238},{"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/bai31/lv2/img\/h9.jpg'\/><\/center>B\u1ed1 tr\u00ed hai \u1ed1ng d\u00e2y 1 v\u00e0 2 \u0111\u1ee9ng y\u00ean c\u1ea1nh nhau nh\u01b0 h\u00ecnh v\u1ebd. V\u1edbi K l\u00e0 ng\u1eaft \u0111i\u1ec7n, R l\u00e0 bi\u1ebfn tr\u1edf trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p n\u00e0o sau \u0111\u00e2y, \u0111i\u1ec7n k\u1ebf G b\u1ecb l\u1ec7ch ?","select":["A. L\u00fac \u0111\u00f3ng kh\u00f3a K.","B. \u0110\u00f3ng kh\u00f3a K v\u00e0 \u0111i\u1ec1u ch\u1ec9nh bi\u1ebfn tr\u1edf v\u1ec1 b\u00ean tr\u00e1i.","C. \u0110\u00f3ng kh\u00f3a K v\u00e0 \u0111i\u1ec1u ch\u1ec9nh bi\u1ebfn tr\u1edf v\u1ec1 b\u00ean ph\u1ea3i.","D. C\u1ea3 3 ph\u01b0\u01a1ng \u00e1n."],"hint":"","explain":"<span class='basic_left'>C\u1ea3 ba tr\u01b0\u1eddng h\u1ee3p \u0111\u1ec1u l\u00e0m cho d\u00f2ng \u0111i\u1ec7n trong m\u1ea1ch 2 thay \u0111\u1ed5i sinh ra t\u1eeb tr\u01b0\u1eddng thay \u0111\u1ed5i l\u00e0m cho d\u00f2ng \u0111i\u1ec7n trong m\u1ea1ch 1 thay \u0111\u1ed5i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3239},{"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/bai31/lv2/img\/h10.jpg'\/><\/center>V\u1edbi th\u00ed nghi\u1ec7m \u0111\u01b0\u1ee3c b\u1ed1 tr\u00ed nh\u01b0 h\u00ecnh 1, d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng xu\u1ea5t hi\u1ec7n \u1edf cu\u1ed9n d\u00e2y d\u1eabn k\u00edn trong tr\u01b0\u1eddng h\u1ee3p n\u00e0o d\u01b0\u1edbi \u0111\u00e2y?","select":["A. Thanh nam ch\u00e2m v\u00e0 cu\u1ed9n d\u00e2y chuy\u1ec3n \u0111\u1ed9ng c\u00f9ng chi\u1ec1u lu\u00f4n c\u00e1ch nhau m\u1ed9t kho\u1ea3ng kh\u00f4ng \u0111\u1ed5i.","B. Thanh nam ch\u00e2m v\u00e0 cu\u1ed9n d\u00e2y \u0111\u1ec1u quay quanh tr\u1ee5c PQ.","C. Thanh nam ch\u00e2m \u0111\u1ee9ng y\u00ean, cu\u1ed9n d\u00e2y quay quanh tr\u1ee5c PQ.","D. Thanh nam ch\u00e2m \u0111\u1ee9ng y\u00ean, cu\u1ed9n d\u00e2y quay quanh tr\u1ee5c AB."],"hint":"","explain":"<span class='basic_left'>Khi \u0111\u00f3 c\u1ea3m \u1ee9ng t\u1eeb sinh ra trong cu\u1ed9n d\u00e2y s\u1ebd b\u1ecb thay \u0111\u1ed5i l\u00e0m 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":1}]}],"id_ques":3240},{"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/bai31/lv2/img\/h13.jpg'\/><\/center>D\u00f9ng m\u1ed9t thanh nam ch\u00e2m v\u00e0 m\u1ed9t v\u00f2ng d\u00e2y d\u1eabn nh\u01b0 h\u00ecnh v\u1ebd. D\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng xu\u1ea5t hi\u1ec7n trong nh\u1eefng th\u1eddi gian n\u00e0o ? Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0111\u00fang trong nh\u1eefng ph\u01b0\u01a1ng \u00e1n sau :","select":["A. Trong th\u1eddi gian ta \u0111\u01b0a nam ch\u00e2m l\u1ea1i g\u1ea7n v\u00f2ng d\u00e2y (1).","B. (1) v\u00e0 (2) \u0111\u00fang.","C. Trong th\u1eddi gian gi\u1eef c\u1ed1 \u0111\u1ecbnh nam ch\u00e2m trong l\u00f2ng v\u00f2ng d\u00e2y (3).","D. Trong th\u1eddi gian ta \u0111\u01b0a nam ch\u00e2m ra xa v\u00f2ng d\u00e2y (2)."],"hint":"","explain":"<span class='basic_left'>D\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng xu\u1ea5t hi\u1ec7n trong nh\u1eefng th\u1eddi gian ta \u0111\u01b0a nam ch\u00e2m l\u1ea1i g\u1ea7n ho\u1eb7c ra xa v\u00f2ng d\u00e2y.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3241},{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai31/lv2/img\/h14.jpg'\/><\/center>Hai \u1ed1ng d\u00e2y \u0111\u01b0\u1ee3c b\u1ed1 tr\u00ed nh\u01b0 h\u00ecnh v\u1ebd. Cu\u1ed9n d\u00e2y 1 \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi \u0111i\u1ec7n k\u1ebf G, cu\u1ed9n 2 n\u1ed1i v\u1edbi ngu\u1ed3n. Trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p n\u00e0o sau \u0111\u00e2y kim \u0111i\u1ec7n k\u1ebf G kh\u00f4ng b\u1ecb l\u1ec7ch ?","select":["A. \u0110\u1ec3 \u1ed1ng 1 v\u00e0 2 \u0111\u1ee9ng y\u00ean (3).","B. C\u1ea3 (1) v\u00e0 (2).","C. \u0110\u01b0a \u1ed1ng d\u00e2y 2 ra xa \u1ed1ng d\u00e2y 1 (2).","D. \u0110\u01b0a \u1ed1ng d\u00e2y 2 l\u1ea1i g\u1ea7n \u1ed1ng d\u00e2y 1 (1)."],"hint":"","explain":"<span class='basic_left'>Tr\u01b0\u1eddng h\u1ee3p kim c\u1ee7a \u0111i\u1ec7n k\u1ebf G kh\u00f4ng b\u1ecb l\u1ec7ch t\u1ee9c l\u00e0 kh\u00f4ng c\u00f3 d\u00f2ng \u0111i\u1ec7n c\u1ea3m \u1ee9ng => Kh\u00f4ng c\u00f3 t\u1eeb tr\u01b0\u1eddng bi\u1ebfn thi\u00ean trong \u1ed1ng d\u00e2y khi \u1ed1ng 1 v\u00e0 \u1ed1ng 2 \u0111\u1ee9ng y\u00ean.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3242},{"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":"Hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb \u0111\u01b0\u1ee3c \u00fang d\u1ee5ng trong m\u1ee5c \u0111\u00ednh n\u00e0o d\u01b0\u1edbi \u0111\u00e2y?","select":["A. D\u00f9ng \u0111\u1ec3 t\u1ea1o ra pin m\u1eb7t tr\u1eddi.","B. D\u00f9ng \u0111\u1ec3 s\u01b0\u1edfi \u1ea5m.","C. D\u00f9ng \u0111\u1ec3 tr\u00e1ng phim m\u00e1y \u1ea3nh.","D. D\u00f9ng \u0111\u1ec3 t\u1ea1o ra nam ch\u00e2m \u0111i\u1ec7n."],"hint":"","explain":"<span class='basic_left'>Hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb \u0111\u01b0\u1ee3c \u00fang d\u1ee5ng trong vi\u1ec7c t\u1ea1o ra nam ch\u00e2m \u0111i\u1ec7n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3243},{"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":"Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0o c\u00f3 th\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n?","select":["A. Hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng.","B. Hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb","C. Hi\u1ec7n t\u01b0\u1ee3ng \u0111\u1ed1i l\u01b0u","D. Kh\u00f4ng c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng n\u00e0o"],"hint":"","explain":"<span class='basic_left'>Hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3244},{"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/bai31/lv2/img\/h15.jpg'\/><\/center>Qu\u1ea5n quanh ph\u1ea7n ngang c\u1ee7a m\u1ed9t nam ch\u00e2m m\u00f3ng ng\u1ef1a m\u1ed9t s\u1ee3i d\u00e2y d\u1eabn b\u1eb1ng \u0111\u1ed3ng, n\u1ed1i hai \u0111\u1ea7u d\u00e2y v\u1edbi \u0111i\u1ec7n k\u1ebf G, d\u00f9ng m\u1ed9t ng\u00e0m s\u1eaft non b\u1ecbt hai c\u1ef1c c\u1ee7a nam ch\u00e2m. Nh\u1eefng tr\u01b0\u1eddng h\u1ee3p n\u00e0o sau \u0111\u00e2y kim \u0111i\u1ec7n k\u1ebf G kh\u00f4ng b\u1ecb l\u1ec7ch ?","select":["A. C\u1ea3 3 \u0111\u00e1p \u00e1n \u0111\u00fang.","B. M\u1edf t\u1ee9c kh\u1eafc ng\u00e0m s\u1eaft non \u1edf hai c\u1ef1c c\u1ee7a nam ch\u00e2m.","C. B\u1ecbt t\u1ee9c kh\u1eafc ng\u00e0m s\u1eaft non \u1edf hai c\u1ef1c c\u1ee7a nam ch\u00e2m.","D. \u0110\u1ec3 y\u00ean ng\u00e0m s\u1eaft non \u1edf hai c\u1ef1c c\u1ee7a nam ch\u00e2m."],"hint":"","explain":"<span class='basic_left'>Kim \u0111i\u1ec7n k\u1ebf G kh\u00f4ng b\u1ecb l\u1ec7ch khi \u0111\u1ec3 y\u00ean ng\u00e0m s\u1eaft non \u1edf hai c\u1ef1c c\u1ee7a nam ch\u00e2m.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3245},{"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":"Hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb kh\u00f4ng xu\u1ea5t hi\u1ec7n trong \u1ed1ng d\u00e2y d\u1eabn k\u00edn khi:","select":["A. C\u00f9ng di chuy\u1ec3n \u1ed1ng d\u00e2y v\u00e0 thanh nam ch\u00e2m v\u1ec1 m\u1ed9t ph\u00eda.","B. Di chuy\u1ec3n \u1ed1ng d\u00e2y v\u00e0 thanh nam ch\u00e2m v\u1ec1 hai ph\u00eda ng\u01b0\u1ee3c chi\u1ec1u nhau.","C. Di chuy\u1ec3n m\u1ed9t thanh nam ch\u00e2m l\u1ea1i g\u1ea7n ho\u1eb7c ra xa \u1ed1ng d\u00e2y.","D. Di chuy\u1ec3n \u1ed1ng d\u00e2y l\u1ea1i g\u1ea7n ho\u1eb7c ra xa thanh nam ch\u00e2m."],"hint":"","explain":"<span class='basic_left'>Hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb kh\u00f4ng xu\u1ea5t hi\u1ec7n trong \u1ed1ng d\u00e2y d\u1eabn k\u00edn khi c\u00f9ng di chuy\u1ec3n \u1ed1ng d\u00e2y v\u00e0 thanh nam ch\u00e2m v\u1ec1 m\u1ed9t ph\u00eda.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3246},{"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":"Dinamo t\u1eeb xe \u0111\u1ea1p c\u00f3 c\u1ea5u t\u1ea1o g\u1ed3m:","select":["A. Nam ch\u00e2m v\u00e0 cu\u1ed9n d\u00e2y d\u1eabn.","B. \u0110i\u1ec7n t\u00edch v\u00e0 cu\u1ed9n d\u00e2y d\u1eabn.","C. Nam ch\u00e2m v\u00e0 \u0111i\u1ec7n t\u00edch.","D. Nam ch\u00e2m \u0111i\u1ec7n v\u00e0 \u0111i\u1ec7n t\u00edch."],"hint":"","explain":"<span class='basic_left'>Dinamo t\u1eeb xe \u0111\u1ea1p c\u00f3 c\u1ea5u t\u1ea1o g\u1ed3m nam ch\u00e2m v\u00e0 cu\u1ed9n d\u00e2y d\u1eabn.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3247},{"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":"Ta c\u00f3 th\u1ec3 d\u00f9ng nam ch\u00e2m n\u00e0o \u0111\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n?","select":["A. Nam ch\u00e2m v\u0129nh c\u1eedu.","B. Nam ch\u00e2m \u0111i\u1ec7n.","C. C\u1ea3 nam ch\u00e2m v\u0129nh c\u1eedu v\u00e0 nam ch\u00e2m \u0111i\u1ec7n.","D. Kh\u00f4ng c\u00f3 lo\u1ea1i nam ch\u00e2m n\u00e0o c\u1ea3."],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3 th\u1ec3 d\u00f9ng c\u1ea3 nam ch\u00e2m v\u0129nh c\u1eedu v\u00e0 nam ch\u00e2m \u0111i\u1ec7n, \u0111\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3248},{"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":"C\u00e1ch n\u00e0o d\u01b0\u1edbi \u0111\u00e2y kh\u00f4ng th\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n?","select":["A. Quay nam ch\u00e2m v\u0129nh c\u1eedu tr\u01b0\u1edbc \u1ed1ng d\u00e2y d\u1eabn k\u00edn.","B. \u0110\u1eb7t nam ch\u00e2m v\u0129nh c\u1eedu tr\u01b0\u1edbc \u1ed1ng d\u00e2y d\u1eabn k\u00edn.","C. \u0110\u01b0a m\u1ed9t c\u1ee5c nam ch\u00e2m t\u1eeb ngo\u00e0i v\u00e0o trong m\u1ed9t cu\u1ed9n d\u00e2y d\u1eabn k\u00edn.","D. R\u00fat cu\u1ed9n d\u00e2y ra xa nam ch\u00e2m v\u0129nh c\u1eedu."],"hint":"","explain":"<span class='basic_left'>\u0110\u1eb7t nam ch\u00e2m v\u0129nh c\u1eedu tr\u01b0\u1edbc \u1ed1ng d\u00e2y d\u1eabn k\u00edn kh\u00f4ng th\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n, v\u00ec kh\u00f4ng c\u00f3 c\u1ea3m \u1ee9ng t\u1eeb thay \u0111\u1ed5i qua cu\u1ed9n d\u00e2y.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3249},{"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":"Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0o sau \u0111\u00e2y kh\u00f4ng li\u00ean quan \u0111\u1ebfn hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb?","select":["A. D\u00f2ng \u0111i\u1ec7n xu\u1ea5t hi\u1ec7n trong d\u00e2y d\u1eabn k\u00edn khi cu\u1ed9n d\u00e2y chuy\u1ec3n \u0111\u1ed9ng trong t\u1eeb tr\u01b0\u1eddng.","B. D\u00f2ng \u0111i\u1ec7n xu\u1ea5t hi\u1ec7n trong cu\u1ed9n d\u00e2y khi n\u1ed1i hai \u0111\u1ea7u cu\u1ed9n d\u00e2y v\u1edbi dinamo xe \u0111\u1ea1p \u0111ang quay.","C. D\u00f2ng \u0111i\u1ec7n xu\u1ea5t hi\u1ec7n trong cu\u1ed9n d\u00e2y n\u1ebfu b\u00ean c\u1ea1nh \u0111\u00f3 c\u00f3 m\u1ed9t d\u00f2ng \u0111i\u1ec7n kh\u00e1c thay \u0111\u1ed5i.","D. D\u00f2ng \u0111i\u1ec7n xu\u1ea5t hi\u1ec7n trong cu\u1ed9n d\u00e2y n\u1ebfu n\u1ed1i hai \u0111\u1ea7u cu\u1ed9n d\u00e2y v\u00e0o hai c\u1ef1c c\u1ee7a b\u00ecnh acquy."],"hint":"","explain":"<span class='basic_left'>D\u00f2ng \u0111i\u1ec7n xu\u1ea5t hi\u1ec7n trong cu\u1ed9n d\u00e2y n\u1ebfu n\u1ed1i hai \u0111\u1ea7u cu\u1ed9n d\u00e2y v\u00e0o hai c\u1ef1c c\u1ee7a b\u00ecnh acquy.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3250}],"lesson":{"save":0,"level":2}}