{"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":"M\u1ed9t nam ch\u00e2m v\u0129nh c\u1eedu c\u00f3 \u0111\u1eb7c t\u00ednh n\u00e0o d\u01b0\u1edbi \u0111\u00e2y?","select":["A. Khi b\u1ecb c\u1ecd x\u00e1t th\u00ec h\u00fat c\u00e1c v\u1eadt nh\u1eb9.","B. Khi b\u1ecb nung n\u00f3ng l\u00ean th\u00ec c\u00f3 th\u1ec3 h\u00fat c\u00e1c v\u1ee5n s\u1eaft.","C. C\u00f3 th\u1ec3 h\u00fat c\u00e1c v\u1eadt b\u1eb1ng s\u1eaft.","D. M\u1ed9t \u0111\u1ea7u c\u00f3 th\u1ec3 h\u00fat, c\u00f2n \u0111\u1ea7u kia th\u00ec \u0111\u1ea9y c\u00e1c v\u1ee5n s\u1eaft."],"hint":"","explain":"<span class='basic_left'>M\u1ed9t nam ch\u00e2m v\u0129nh c\u1eedu c\u00f3 \u0111\u1eb7c t\u00ednh l\u00e0 c\u00f3 th\u1ec3 h\u00fat c\u00e1c v\u1eadt b\u1eb1ng s\u1eaft.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3051},{"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\u00f3 hai thanh kim lo\u1ea1i A, B b\u1ec1 ngo\u00e0i gi\u1ed1ng h\u1ec7t nhau, trong \u0111\u00f3 m\u1ed9t thanh l\u00e0 nam ch\u00e2m. L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c thanh n\u00e0o l\u00e0 nam ch\u00e2m?","select":["A. \u0110\u01b0a thanh A l\u1ea1i g\u1ea7n thanh B, n\u1ebfu A h\u00fat B th\u00ec A l\u00e0 nam ch\u00e2m.","B. \u0110\u01b0a thanh A l\u1ea1i g\u1ea7n thanh B, n\u1ebfu A \u0111\u1ea9y B th\u00ec A l\u00e0 nam ch\u00e2m.","C. D\u00f9ng m\u1ed9t s\u1ee3i ch\u1ec9 m\u1ec1m bu\u1ed9c v\u00e0o gi\u1eefa thanh kim lo\u1ea1i r\u1ed3i treo l\u00ean, n\u1ebfu khi c\u00e2n b\u1eb1ng thanh \u0111\u00f3 lu\u00f4n n\u1eb1m theo h\u01b0\u1edbng B\u1eafc-Nam th\u00ec \u0111\u00f3 l\u00e0 thanh nam ch\u00e2m.","D. \u0110\u01b0a thanh kim lo\u1ea1i l\u00ean cao r\u1ed3i th\u1ea3 cho r\u01a1i, n\u1ebfu thanh \u0111\u00f3 lu\u00f4n r\u01a1i l\u1ec7ch v\u1ec1 m\u1ed9t c\u1ef1c c\u1ee7a Tr\u00e1i \u0110\u1ea5t th\u00ec \u0111\u00f3 l\u00e0 nam ch\u00e2m."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c thanh n\u00e0o l\u00e0 nam ch\u00e2m ta l\u00e0m nh\u01b0 sau: D\u00f9ng m\u1ed9t s\u1ee3i ch\u1ec9 m\u1ec1m bu\u1ed9c v\u00e0o gi\u1eefa thanh kim lo\u1ea1i r\u1ed3i treo l\u00ean, n\u1ebfu khi c\u00e2n b\u1eb1ng thanh \u0111\u00f3 lu\u00f4n n\u1eb1m theo h\u01b0\u1edbng B\u1eafc-Nam th\u00ec \u0111\u00f3 l\u00e0 thanh nam ch\u00e2m.<br\/>V\u00ec Kim ( ho\u1eb7c thanh ) nam ch\u00e2m t\u1ef1 do, khi \u0111\u00e3 \u0111\u1ee9ng c\u00e2n b\u1eb1ng lu\u00f4n ch\u1ec9 h\u01b0\u1edbng nam- b\u1eafc c\u1ef1c ch\u1ec9 h\u01b0\u1edbng b\u1eafc g\u1ecdi l\u00e0 c\u1ef1c b\u1eafc, c\u1ef1c ch\u1ec9 h\u01b0\u1edbng nam g\u1ecdi l\u00e0 c\u1ef1c nam .<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3052},{"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 m\u1ed9t thanh nam ch\u00e2m th\u1eb3ng b\u1ecb g\u00e3y th\u00e0nh hai n\u1eeda. Nh\u1eadn \u0111\u1ecbnh n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0 \u0111\u00fang?","select":["A. M\u1ed7i n\u1eeda t\u1ea1o th\u00e0nh nam ch\u00e2m m\u1edbi ch\u1ec9 c\u00f3 m\u1ed9t t\u1eeb c\u1ef1c \u1edf m\u1ed9t \u0111\u1ea7u.","B. Hai n\u1eefa \u0111\u1ec1u m\u1ea5t h\u1ebft t\u1eeb t\u00ednh.","C. M\u1ed7i n\u1eeda th\u00e0nh m\u1ed9t nam ch\u00e2m m\u1edbi c\u00f3 hai c\u1ef1c c\u00f9ng t\u00ean \u1edf hai \u0111\u1ea7u.","D. M\u1ed7i n\u1eeda th\u00e0nh m\u1ed9t nam ch\u00e2m m\u1edbi c\u00f3 hai c\u1ef1c t\u1eeb kh\u00e1c t\u00ean \u1edf hai \u0111\u1ea7u."],"hint":"","explain":"<span class='basic_left'>Khi m\u1ed9t thanh nam ch\u00e2m th\u1eb3ng b\u1ecb g\u00e3y th\u00e0nh hai n\u1eeda: <br\/>khi \u0111\u00f3 m\u1ed7i n\u1eeda th\u00e0nh m\u1ed9t nam ch\u00e2m m\u1edbi c\u00f3 hai c\u1ef1c t\u1eeb kh\u00e1c t\u00ean \u1edf hai \u0111\u1ea7u.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3053},{"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\u00ec sao c\u00f3 th\u1ec3 n\u00f3i r\u1eb1ng Tr\u00e1i \u0110\u1ea5t gi\u1ed1ng nh\u01b0 m\u1ed9t thanh nam ch\u00e2m kh\u1ed5ng l\u1ed3?","select":["A. V\u00ec Tr\u00e1i \u0110\u1ea5t h\u00fat t\u1ea5t c\u1ea3 c\u00e1c v\u1eadt v\u1ec1 ph\u00eda n\u00f3.","B. V\u00ec Tr\u00e1i \u0110\u1ea5t h\u00fat c\u00e1c v\u1eadt b\u1eb1ng s\u1eaft v\u1ec1 ph\u00eda n\u00f3. ","C. V\u00ec Tr\u00e1i \u0110\u1ea5t h\u00fat c\u00e1c thanh nam ch\u00e2m v\u1ec1 ph\u00eda n\u00f3.","D. V\u00ec m\u1ed7i c\u1ef1c c\u1ee7a thanh nam ch\u00e2m \u0111\u1ec3 t\u1ef1 do lu\u00f4n h\u01b0\u1edbng v\u1ec1 m\u1ed9t c\u1ef1c c\u1ee7a Tr\u00e1i \u0110\u1ea5t."],"hint":"","explain":"<span class='basic_left'>C\u00f3 th\u1ec3 n\u00f3i r\u1eb1ng Tr\u00e1i \u0110\u1ea5t gi\u1ed1ng nh\u01b0 m\u1ed9t thanh nam ch\u00e2m kh\u1ed5ng l\u1ed3 v\u00ec m\u1ed7i c\u1ef1c c\u1ee7a thanh nam ch\u00e2m \u0111\u1ec3 t\u1ef1 do lu\u00f4n h\u01b0\u1edbng v\u1ec1 m\u1ed9t c\u1ef1c c\u1ee7a Tr\u00e1i \u0110\u1ea5t.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3054},{"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\u00ean thanh nam ch\u00e2m, ch\u1ed7 n\u00e0o h\u00fat s\u1eaft m\u1ea1nh nh\u1ea5t?","select":["A. Ph\u1ea7n gi\u1eefa c\u1ee7a thanh.","B. Ch\u1ec9 c\u00f3 t\u1eeb c\u1ef1c B\u1eafc.","C. C\u1ea3 hai t\u1eeb c\u1ef1c. ","D. M\u1ecdi ch\u1ed7 \u0111\u1ec1u h\u00fat s\u1eaft m\u1ea1nh nh\u01b0 nhau."],"hint":"","explain":"<span class='basic_left'>Tr\u00ean thanh nam ch\u00e2m, ch\u1ed7 h\u00fat s\u1eaft m\u1ea1nh nh\u1ea5t l\u00e0 c\u1ea3 hai t\u1eeb c\u1ef1c<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3055},{"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":"M\u1ed9t kim b\u1eb1ng kim lo\u1ea1i c\u00f3 th\u1ec3 quay quanh m\u1ed9t tr\u1ee5c th\u1eb3ng \u0111\u1ee9ng. Khi \u0111\u01b0a m\u1ed9t \u0111\u1ea7u c\u1ee7a thanh nam ch\u00e2m l\u1ea1i g\u1ea7n kim, kim b\u1ecb h\u00fat. \u0110\u1ed5i c\u1ef1c c\u1ee7a thanh nam ch\u00e2m v\u00e0 \u0111\u01b0a l\u1ea1i g\u1ea7n kim, kim c\u0169ng b\u1ecb h\u00fat. H\u00e3y cho bi\u1ebft kim tr\u00ean tr\u1ee5c quay l\u00e0 g\u00ec ?","select":["A. Kim b\u1eb1ng \u0111\u1ed3ng.","B. Kim nam ch\u00e2m. ","C. Kim b\u1eb1ng s\u1eaft.","D. Kim b\u1eb1ng nh\u00f4m."],"hint":"","explain":"<span class='basic_left'>V\u00ec kim b\u1ecb h\u00fat b\u1edfi c\u1ea3 2 c\u1ef1c n\u00ean kim b\u1eb1ng s\u1eaft. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3056},{"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":"Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y \u0111\u00fang khi n\u00f3i v\u1ec1 nam ch\u00e2m ?","select":["A. Khi b\u1ebb g\u00e3y nam ch\u00e2m, ta c\u00f3 th\u1ec3 t\u00e1ch hai c\u1ef1c ra kh\u1ecfi nhau.","B. Nam ch\u00e2m l\u00e0 nh\u1eefng v\u1eadt c\u00f3 \u0111\u1eb7c t\u00ednh h\u00fat s\u1eaft. ","C. Nam ch\u00e2m n\u00e0o c\u0169ng c\u00f3 hai c\u1ef1c : C\u1ef1c d\u01b0\u01a1ng v\u00e0 c\u1ef1c \u00e2m. ","D. C\u1ea3 3 ph\u00e1t bi\u1ec3u \u0111\u00fang."],"hint":"","explain":"<span class='basic_left'>Nam ch\u00e2m l\u00e0 nh\u1eefng v\u1eadt c\u00f3 \u0111\u1eb7c t\u00ednh h\u00fat s\u1eaft. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3057},{"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":"Nh\u1eefng lo\u1ea1i nam ch\u00e2m th\u01b0\u1eddng d\u00f9ng trong ph\u00f2ng th\u00ed nghi\u1ec7m \u1edf nh\u00e0 tr\u01b0\u1eddng l\u00e0 :","select":["A. Nam ch\u00e2m m\u00f3ng ng\u1ef1a, nam ch\u00e2m tr\u00f2n, kim nam ch\u00e2m. ","B. Nam ch\u00e2m th\u1eb3ng, nam ch\u00e2m m\u00f3ng ng\u1ef1a, nam ch\u00e2m tr\u00f2n.","C. Nam ch\u00e2m th\u1eb3ng, nam ch\u00e2m tr\u00f2n, kim nam ch\u00e2m.","D. Nam ch\u00e2m th\u1eb3ng, nam ch\u00e2m m\u00f3ng ng\u1ef1a, kim nam ch\u00e2m."],"hint":"","explain":"<span class='basic_left'>Nh\u1eefng lo\u1ea1i nam ch\u00e2m th\u01b0\u1eddng d\u00f9ng trong ph\u00f2ng th\u00ed nghi\u1ec7m \u1edf nh\u00e0 tr\u01b0\u1eddng l\u00e0 nam ch\u00e2m th\u1eb3ng, nam ch\u00e2m m\u00f3ng ng\u1ef1a, kim nam ch\u00e2m. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3058},{"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":"Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang nh\u1ea5t khi n\u00f3i v\u1ec1 t\u01b0\u01a1ng t\u00e1c gi\u1eefa hai nam ch\u00e2m ?","select":["A. C\u00e1c c\u1ef1c c\u00f9ng t\u00ean th\u00ec \u0111\u1ea9y nhau, kh\u00e1c t\u00ean th\u00ec h\u00fat nhau. \u0110i\u1ec1u n\u00e0y ch\u1ec9 c\u00f3 th\u1ec3 x\u1ea3y ra khi ch\u00fang \u1edf r\u1ea5t g\u1ea7n nhau.","B. C\u00e1c c\u1ef1c c\u00f9ng t\u00ean th\u00ec \u0111\u1ea9y nhau, kh\u00e1c t\u00ean th\u00ec h\u00fat nhau.","C. C\u00e1c c\u1ef1c c\u00f9ng t\u00ean th\u00ec h\u00fat nhau, kh\u00e1c t\u00ean th\u00ec \u0111\u1ea9y nhau.","D. C\u00e1c c\u1ef1c c\u00f9ng t\u00ean th\u00ec h\u00fat nhau, kh\u00e1c t\u00ean th\u00ec \u0111\u1ea9y nhau. \u0110i\u1ec1u n\u00e0y ch\u1ec9 c\u00f3 th\u1ec3 x\u1ea3y ra khi ch\u00fang \u1edf r\u1ea5t g\u1ea7n nhau."],"hint":"","explain":"<span class='basic_left'>C\u00e1c c\u1ef1c c\u00f9ng t\u00ean th\u00ec \u0111\u1ea9y nhau, kh\u00e1c t\u00ean th\u00ec h\u00fat nhau. \u0110i\u1ec1u n\u00e0y ch\u1ec9 c\u00f3 th\u1ec3 x\u1ea3y ra khi ch\u00fang \u1edf r\u1ea5t g\u1ea7n nhau. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3059},{"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":"Thanh nam ch\u00e2m th\u1eb3ng h\u00fat c\u00e1c v\u1eadt b\u1eb1ng s\u1eaft, th\u00e9p m\u1ea1nh nh\u1ea5t \u1edf v\u1ecb tr\u00ed n\u00e0o ?","select":["A. Hai \u0111\u1ea7u c\u1ef1c.","B. Ch\u00ednh gi\u1eefa thanh nam ch\u00e2m.","C. T\u1ea1i b\u1ea5t k\u00ec \u0111i\u1ec3m n\u00e0o.","D. G\u1ea7n hai \u0111\u1ea7u c\u1ef1c."],"hint":"","explain":"<span class='basic_left'>Thanh nam ch\u00e2m th\u1eb3ng h\u00fat c\u00e1c v\u1eadt b\u1eb1ng s\u1eaft, th\u00e9p m\u1ea1nh nh\u1ea5t \u1edf hai \u0111\u1ea7u c\u1ef1c. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3060},{"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":"V\u1eadt n\u00e0o d\u01b0\u1edbi \u0111\u00e2y s\u1ebd tr\u1edf th\u00e0nh nam ch\u00e2m v\u0129nh c\u1eedu khi \u0111\u01b0\u1ee3c \u0111\u1eb7t v\u00e0o trong l\u00f2ng m\u1ed9t \u1ed1ng d\u00e2y c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua?","select":["A. Thanh th\u00e9p.","B. Thanh nh\u00f4m.","C. Thanh s\u1eaft non.","D. Thanh \u0111\u1ed3ng."],"hint":"","explain":"<span class='basic_left'>Thanh s\u1eaft non s\u1ebd tr\u1edf th\u00e0nh nam ch\u00e2m v\u0129nh c\u1eedu khi \u0111\u01b0\u1ee3c \u0111\u1eb7t v\u00e0o trong l\u00f2ng m\u1ed9t \u1ed1ng d\u00e2y c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3061},{"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":"Nam ch\u00e2m m\u00f3ng ng\u1ef1a 'h\u00fat' c\u00e1c v\u1eadt b\u1eb1ng s\u1eaft, th\u00e9p m\u1ea1nh nh\u1ea5t \u1edf v\u1ecb tr\u00ed n\u00e0o ?","select":["A. T\u1ea1i hai \u0111\u1ea7u c\u1ef1c c\u1ee7a nam ch\u00e2m.","B. Ph\u1ea7n th\u1eb3ng c\u1ee7a nam ch\u00e2m.","C. T\u1ea1i b\u1ea5t k\u00ec \u0111i\u1ec3m n\u00e0o.","D. T\u1ea5t c\u1ea3 \u0111\u1ec1u sai."],"hint":"","explain":"<span class='basic_left'>Nam ch\u00e2m m\u00f3ng ng\u1ef1a 'h\u00fat' c\u00e1c v\u1eadt b\u1eb1ng s\u1eaft, th\u00e9p m\u1ea1nh nh\u1ea5t t\u1ea1i hai \u0111\u1ea7u c\u1ef1c c\u1ee7a nam ch\u00e2m. V\u00ec \u0111\u00f3 l\u00e0 n\u01a1i t\u1eadp trung t\u1eeb tr\u01b0\u1eddng nhi\u1ec1u nh\u1ea5t.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3062},{"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":"M\u1ed9t thanh nam ch\u00e2m th\u1eb3ng \u0111\u01b0\u1ee3c c\u01b0a ra th\u00e0nh nhi\u1ec1u \u0111o\u1ea1n ng\u1eafn. Ch\u00fang s\u1ebd tr\u1edf th\u00e0nh thanh g\u00ec ?","select":["A. Nh\u1eefng thanh kim lo\u1ea1i nh\u1ecf kh\u00f4ng c\u00f3 t\u1eeb t\u00ednh.","B. Nh\u1eefng thanh nam ch\u00e2m nh\u1ecf, m\u1ed7i nam ch\u00e2m nh\u1ecf c\u00f3 \u0111\u1ea7y \u0111\u1ee7 hai c\u1ef1c.","C. T\u1ea5t c\u1ea3 sai.","D. Nh\u1eefng thanh nam ch\u00e2m nh\u1ecf, m\u1ed7i nam ch\u00e2m nh\u1ecf ch\u1ec9 c\u00f3 m\u1ed9t c\u1ef1c."],"hint":"","explain":"<span class='basic_left'>M\u1ed9t thanh nam ch\u00e2m th\u1eb3ng \u0111\u01b0\u1ee3c c\u01b0a ra th\u00e0nh nhi\u1ec1u \u0111o\u1ea1n ng\u1eafn. Ch\u00fang s\u1ebd tr\u1edf th\u00e0nh thanh nh\u1eefng thanh nam ch\u00e2m nh\u1ecf, m\u1ed7i nam ch\u00e2m nh\u1ecf c\u00f3 \u0111\u1ea7y \u0111\u1ee7 hai c\u1ef1c. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3063},{"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/bai21/lv2/img\/14.jpg'\/><\/center>Quan s\u00e1t h\u00ecnh v\u1ebd sau, khi cho c\u1ef1c N c\u1ee7a nam ch\u00e2m B ti\u1ebfp x\u00fac v\u1edbi c\u1ef1c S c\u1ee7a thanh nam ch\u00e2m A th\u00ec \u0111inh s\u1eaft s\u1ebd nh\u01b0 th\u1ebf n\u00e0o ?","select":["A. B\u1ecb h\u00fat m\u1ea1nh g\u1ea5p \u0111\u00f4i.","B. B\u1ecb h\u00fat nh\u01b0 c\u0169.","C. B\u1ecb r\u01a1i ra.","D. B\u1ecb h\u00fat gi\u1ea3m \u0111i m\u1ed9t n\u1eeda."],"hint":"","explain":"<span class='basic_left'>Khi cho c\u1ef1c N c\u1ee7a nam ch\u00e2m B ti\u1ebfp x\u00fac v\u1edbi c\u1ef1c S c\u1ee7a thanh nam ch\u00e2m A th\u00ec \u0111inh s\u1eaft s\u1ebd b\u1ecb r\u01a1i ra do t\u1eeb tr\u01b0\u1eddng 2 nam ch\u00e2m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn thanh s\u1eaft tri\u1ec7t ti\u00eau nhau.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3064},{"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":"Ng\u01b0\u1eddi ta d\u00f9ng la b\u00e0n \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh h\u01b0\u1edbng b\u1eafc \u0111\u1ecba l\u00ed. T\u00ecm hi\u1ec3u c\u1ea5u t\u1ea1o c\u1ee7a la b\u00e0n v\u00e0 cho bi\u1ebft b\u1ed9 ph\u1eadn ch\u00ednh c\u1ee7a la b\u00e0n l\u00e0 b\u1ed9 ph\u1eadn n\u00e0o sau \u0111\u00e2y :","select":["A. M\u1ed9t cu\u1ed9n d\u00e2y.","B. M\u1ed9t thanh nam ch\u00e2m th\u1eb3ng \u0111\u1ee9ng.","C. M\u1ed9t kim nam ch\u00e2m.","D. M\u1ed9t thanh kim lo\u1ea1i."],"hint":"","explain":"<span class='basic_left'>B\u1ed9 ph\u1eadn ch\u00ednh c\u1ee7a la b\u00e0n l\u00e0 kim nam ch\u00e2m. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3065},{"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":"\u0110\u01b0a 1 thanh nam ch\u00e2m t\u1edbi g\u1ea7n m\u1ed9t h\u1ed7n h\u1ee3p th\u00ec v\u1eadt n\u00e0o sau \u0111\u00e2y s\u1ebd b\u1ecb h\u00fat?","select":["A. \u0110inh s\u1eaft.","B. M\u1ea9u gi\u1ea5y.","C. Vi\u00ean s\u1ecfi.","D. C\u1ea3 3 v\u1eadt tr\u00ean."],"hint":"","explain":"<span class='basic_left'>\u0110\u01b0a 1 thanh nam ch\u00e2m t\u1edbi g\u1ea7n m\u1ed9t h\u1ed7n h\u1ee3p th\u00ec s\u1eaft s\u1ebd b\u1ecb h\u00fat. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3066},{"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":"\u0110\u01b0a nam ch\u00e2m t\u1edbi g\u1ea7n 1 mi\u1ebfng s\u1eaft. Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang.","select":["A. C\u1ea3 c\u1ef1c B\u1eafc v\u00e0 c\u1ef1c Nam \u0111\u1ec1u h\u00fat mi\u1ebfng s\u1eaft.","B. Ch\u1ec9 c\u1ef1c Nam h\u00fat mi\u1ebfng s\u1eaft.","C. Ch\u1ec9 c\u1ef1c B\u1eafc h\u00fat mi\u1ebfng s\u1eaft.","D. B\u1ea5t k\u00ec \u0111i\u1ec3m n\u00e0o tr\u00ean thanh nam ch\u00e2m \u0111\u1ec1u kh\u00f4ng h\u00fat mi\u1ebfng s\u1eaft."],"hint":"","explain":"<span class='basic_left'>\u0110\u01b0a nam ch\u00e2m t\u1edbi g\u1ea7n 1 mi\u1ebfng s\u1eaft th\u00ec c\u1ea3 c\u1ef1c B\u1eafc v\u00e0 c\u1ef1c Nam \u0111\u1ec1u h\u00fat mi\u1ebfng s\u1eaft.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3067},{"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":"M\u1ed9t thanh s\u1eaft non v\u00e0 m\u1ed9t thanh th\u00e9p cho ti\u1ebfp x\u00fac v\u1edbi m\u1ed9t nam ch\u00e2m v\u0129nh c\u1eedu. Khi kh\u00f4ng cho hai thanh tr\u00ean ti\u1ebfp x\u00fac v\u1edbi thanh nam ch\u00e2m n\u1eefa th\u00ec :","select":["A. Ch\u1ec9 c\u00f3 thanh th\u00e9p c\u00f2n t\u1eeb t\u00ednh.","B. Ch\u1ec9 c\u00f3 thanh s\u1eaft non c\u00f2n t\u1eeb t\u00ednh.","C. C\u1ea3 hai thanh v\u1eabn c\u00f2n t\u1eeb t\u00ednh.","D. C\u1ea3 hai m\u1ea5t t\u1eeb t\u00ednh."],"hint":"","explain":"<span class='basic_left'>Khi kh\u00f4ng cho hai thanh tr\u00ean ti\u1ebfp x\u00fac v\u1edbi thanh nam ch\u00e2m n\u1eefa th\u00ec ch\u1ec9 c\u00f3 thanh th\u00e9p c\u00f2n t\u1eeb t\u00ednh. Do th\u00e9p c\u00f3 kh\u1ea3 n\u0103ng nhi\u1ec5m t\u1eeb. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3068},{"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":"Th\u1ea3 hai nam ch\u00e2m nh\u1ecf h\u00ecnh tr\u1ee5 gi\u1ed1ng nhau v\u00e0o m\u1ed9t \u1ed1ng nghi\u1ec7m, th\u1ea5y nam ch\u00e2m b\u00ean tr\u00ean 'l\u01a1 l\u1eedng'. H\u00e3y ch\u1ecdn c\u00e2u gi\u1ea3i th\u00edch \u0111\u00fang.","select":["A. Hai c\u1ef1c c\u1ee7a nam ch\u00e2m \u0111\u1ed1i di\u1ec7n nhau kh\u00e1c t\u00ean n\u00ean \u0111\u1ea9y nhau.","B. Hai c\u1ef1c c\u1ee7a nam ch\u00e2m \u0111\u1ed1i di\u1ec7n nhau c\u00f9ng t\u00ean n\u00ean \u0111\u1ea9y nhau.","C. Do l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t c\u1ee7a kh\u00f4ng kh\u00ed.","D. T\u1ea5t c\u1ea3 sai."],"hint":"","explain":"<span class='basic_left'>Do l\u1ef1c c\u1ee7a nam ch\u00e2m b\u00ean d\u01b0\u1edbi \u0111\u1ea9y c\u00e2n b\u1eb1ng v\u1edbi tr\u1ecdng l\u1ef1c c\u1ee7a nam ch\u00e2m b\u00ean tr\u00ean n\u00ean th\u1ea5y nam ch\u00e2m b\u00ean tr\u00ean 'l\u01a1 l\u1eedng'<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3069},{"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\u1eb7t m\u1ed9t thanh g\u1ed7 m\u1ecfng v\u00e0o hai \u0111\u1ea7u c\u1ef1c c\u1ee7a m\u1ed9t thanh nam ch\u00e2m m\u00f3ng ng\u1ef1a. \u0110\u01b0a chi\u1ebfc \u0111inh s\u1eaft l\u1ea1i g\u1ea7n s\u00e1t hai \u0111\u1ea7u thanh g\u1ed7 th\u00ec :","select":["A. \u0110inh s\u1eaft b\u1ecb \u0111\u1ea9y.","B. \u0110inh s\u1eaft kh\u00f4ng b\u1ecb h\u00fat.","C. \u0110inh s\u1eaft c\u00f3 l\u00fac b\u1ecb h\u00fat, c\u00f3 l\u00fac b\u1ecb \u0111\u1ea9y.","D. \u0110inh s\u1eaft b\u1ecb h\u00fat."],"hint":"","explain":"<span class='basic_left'>\u0110inh s\u1eaft b\u1ecb h\u00fat do t\u1eeb tr\u01b0\u1eddng c\u1ee7a nam ch\u00e2m \u0111i xuy\u00ean \u0111\u01b0\u1ee3c qua g\u1ed7. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3070}],"lesson":{"save":0,"level":2}}