C\u00e1c nam ch\u00e2m th\u1ebf h\u1ec7 m\u1edbi \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb nh\u1eefng v\u1eadt li\u1ec7u h\u1ea9u nh\u01b0 kh\u00f4ng l\u00e0m m\u1ea5t t\u1eeb t\u00ednh theo th\u1eddi gian nh\u01b0 c\u00e1c lo\u1ea1i nam ch\u00e2m h\u00ecnh ch\u1eef U tr\u01b0\u1edbc kia.<\/p>\n\n\n\n
Nam ch\u00e2m g\u1ed3m r\u1ea5t nhi\u1ec1u v\u00f9ng t\u1eeb t\u00ednh nh\u1ecf g\u1ecdi l\u00e0 mi\u1ec1n. T\u1eeb tr\u01b0\u1eddng c\u1ee7a nam ch\u00e2m \u0111i theo h\u01b0\u1edbng ng\u01b0\u1ee3c chi\u1ec1u v\u1edbi c\u00e1c mi\u1ec1n t\u1ea1o ra t\u1eeb tr\u01b0\u1eddng \u0111\u00f3. \u0110i\u1ec1u n\u00e0y c\u00f3 xu h\u01b0\u1edbng l\u00e0m c\u00e1c mi\u1ec1n quay ng\u01b0\u1ee3c chi\u1ec1u t\u1eeb tr\u01b0\u1eddng c\u1ee7a ch\u00fang l\u1ea1i.<\/p>\n\n\n\n
V\u1edbi nam ch\u00e2m hi\u1ec7n \u0111\u1ea1i, c\u00e1c mi\u1ec1n \u1edf m\u1ee9c \u0111\u1ed9 n\u00e0o \u0111\u00f3 b\u1ecb t\u00ea li\u1ec7t v\u1ec1 m\u1eb7t n\u0103ng l\u01b0\u1ee3ng, l\u00e0m ch\u00fang kh\u00f4ng d\u1ec5 b\u1ecb t\u00e1c \u0111\u1ed9ng b\u1edfi hi\u1ec7u \u1ee9ng tr\u00ean. C\u1ee5c nam ch\u00e2m ch\u1ec9 m\u1ea5t t\u1eeb t\u00ednh khi b\u1ecb \u0111un n\u00f3ng \u1edf nhi\u1ec7t \u0111\u1ed9 cao ho\u1eb7c b\u1ecb rung \u0111\u1ed9ng m\u1ea1nh.<\/p>\n\n\n\n
C\u00e1c nam ch\u00e2m ki\u1ec3u m\u1edbi s\u1eed d\u1ee5ng nh\u1eefng ch\u1ea5t li\u1ec7u nh\u01b0 alnico (h\u1ee3p ch\u1ea5t g\u1ed3m nh\u00f4m – nickel cobalt) v\u00e0 cobalt samarium c\u00f3c\u1ea5u tr\u00fac n\u1ed9i t\u1ea1i ng\u0103n ch\u1eb7n s\u1ef1 tho\u00e1i ho\u00e1 c\u1ee7a c\u00e1c m\u1ea1ch t\u1eeb. Ch\u00fang \u0111\u01b0\u1ee3c chia th\u00e0nh nhi\u1ec1u m\u1ea3nh v\u1ee5n nh\u1ecf, m\u1ed7i m\u1ea3nh l\u00e0 m\u1ed9t mi\u1ec1n. Ng\u01b0\u1ee3c l\u1ea1i, nam ch\u00e2m h\u00ecnh ch\u1eef U ki\u1ec3u c\u0169 c\u00f3 mi\u1ec1n l\u1edbn h\u01a1n r\u1ea5t nhi\u1ec1u, l\u00e0 nh\u1eefng m\u1ea9u s\u1eaft c\u1ee9ng v\u1edbi mi\u1ec1n \u0111\u01b0\u1ee3c bao b\u1ecdc b\u1edfi c\u00e1c t\u1ea1p ch\u1ea5t carbua s\u1eaft. M\u1ed9t \u0111i\u1ec1u t\u01b0\u1edfng nh\u01b0 ngh\u1ecbch l\u00fd \u1edf \u0111\u00e2y l\u00e0 nh\u1eefng m\u1ea3nh v\u1ee5n nh\u1ecf v\u1edbi k\u00edch th\u01b0\u1edbc t\u1ed1i \u01b0u l\u1ea1i c\u00f3 t\u00ednh n\u0103ng \u1ed5n \u0111\u1ecbnh h\u01a1n nh\u1eefng m\u1ea3nh l\u1edbn trong c\u00e1c ch\u1ea5t t\u1eeb t\u00ednh. Do v\u1eady, lo\u1ea1i nam ch\u00e2m ch\u1eef U k\u00e9m b\u1ec1n v\u1eefng h\u01a1n nhi\u1ec1u so v\u1edbi nam ch\u00e2m ki\u1ec3u m\u1edbi.<\/p>\n","protected":false},"excerpt":{"rendered":"
C\u00e1c nam ch\u00e2m th\u1ebf h\u1ec7 m\u1edbi \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb nh\u1eefng v\u1eadt li\u1ec7u h\u1ea9u nh\u01b0 kh\u00f4ng l\u00e0m m\u1ea5t t\u1eeb t\u00ednh theo th\u1eddi gian nh\u01b0 c\u00e1c lo\u1ea1i nam ch\u00e2m h\u00ecnh ch\u1eef U tr\u01b0\u1edbc kia. Nam ch\u00e2m g\u1ed3m r\u1ea5t nhi\u1ec1u v\u00f9ng t\u1eeb t\u00ednh nh\u1ecf g\u1ecdi l\u00e0 mi\u1ec1n. T\u1eeb tr\u01b0\u1eddng c\u1ee7a nam ch\u00e2m \u0111i theo h\u01b0\u1edbng ng\u01b0\u1ee3c chi\u1ec1u v\u1edbi […]<\/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":[1,15],"tags":[],"class_list":["post-10950","post","type-post","status-publish","format-standard","hentry","category-general","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/10950","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=10950"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/10950\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=10950"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=10950"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=10950"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}