{"id":37066,"date":"2025-11-03T02:19:07","date_gmt":"2025-11-03T00:19:07","guid":{"rendered":"https:\/\/www.cpge-brizeux.fr\/wordpress\/non-classe\/electromagnetisme-4-materiaux-ferromagnetiques.html"},"modified":"2025-11-07T00:47:21","modified_gmt":"2025-11-06T22:47:21","slug":"electromagnetisme-4-materiaux-ferromagnetiques","status":"publish","type":"post","link":"https:\/\/www.cpge-brizeux.fr\/wordpress\/psi\/physchim-psi-2526\/electromagnetisme-4-materiaux-ferromagnetiques.html","title":{"rendered":"\u00c9lectromagn\u00e9tisme 4 : Mat\u00e9riaux ferromagn\u00e9tiques"},"content":{"rendered":"<h2>T\u00e9l\u00e9chargements<\/h2>\n<p><a href='https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-content\/uploads\/electromagnetisme-4-materiaux-ferromagnetiques-poly.pdf'>Polycopi\u00e9<\/a><\/p>\n<p><a href='https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-content\/uploads\/electromagnetisme-4-materiaux-ferromagnetiques-flashcards.apkg'>Flashcards Anki<\/a><\/p>\n<h2>Coups de pouce<\/h2>\n<p>Laisser la souris\/taper sur le texte pour l&rsquo;afficher.<\/p>\n<div class='coups-de-pouce'>\n<h5>Exercice 1<\/h5>\n<ol>\n<li>\n<ul>\n<li>\n    Effectuer les 4 \u00e9tapes : analyse de invariances, des sym\u00e9tries, choix de la courbe d\u2019Amp\u00e8re et th\u00e9or\u00e8me d\u2019Amp\u00e8re (dans un milieu magn\u00e9tique).\n  <\/li>\n<li>\n    Sur quelle surface doit-on int\u00e9grer B ? Cette surface est-elle dans le tore ou en dehors ?\n  <\/li>\n<li>\n    Quelle relation existe-t-il entre <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 0.784em; height: 0.683em;\" viewBox=\"0 0 8.624 7.513000000000001\" width=\"8.624pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 0 7.513000000000001)\"><use xlink:href=\"#g3E995207BA930C94107C99A15339EEAD\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><\/g><defs id=\"glyph\"><symbol id=\"g3E995207BA930C94107C99A15339EEAD\" overflow=\"visible\"><path d=\"M 0 0m 8.316 5.973 c 0 1.0009999 -0.99000025 1.54 -2.0679998 1.54 h -3.6520002 c -0.25300002 0 -0.36299992 -0.011000156 -0.36299992 -0.26399994 c 0 -0.17600012 0.22000003 -0.16499996 0.352 -0.16499996 c 0.32999992 -0.011000156 0.5279999 -0.032999992 0.58299994 -0.04400015 c 0.055000067 -0.011000156 0.0769999 -0.04400015 0.0769999 -0.09899998 c 0 -0.021999836 -0.010999918 -0.08799982 -0.04399991 -0.19799995 l -1.452 -5.841 c -0.054999948 -0.24200004 -0.16499996 -0.385 -0.32999992 -0.44 c -0.07700002 -0.022000015 -0.27499998 -0.033000022 -0.61600006 -0.033000022 c -0.23099995 0 -0.34099996 -0.088 -0.34099996 -0.264 c 0 -0.10999999 0.110000014 -0.16499999 0.34099996 -0.16499999 h 3.883 c 0.71500015 0 1.375 0.22 2.0019999 0.649 c 0.6930003 0.473 1.0450001 1.056 1.0450001 1.7380002 c 0 0.86899996 -0.7149997 1.3969998 -1.4959998 1.5509999 c 0.96799994 0.23100019 2.079 0.9680002 2.079 2.035 Z m -2.2220001 1.1110001 c 0.7590003 0 1.144 -0.35200024 1.144 -1.0669999 c 0 -0.56100035 -0.21999979 -1.0230002 -0.68200016 -1.3970003 c -0.4619999 -0.37400007 -0.9789996 -0.5499997 -1.54 -0.5499997 h -1.5289998 l 0.65999985 2.6399999 c 0.0880003 0.37400007 0.0880003 0.37400007 0.5500002 0.37400007 Z m 0.3080001 -3.795 c 0.1539998 -0.25300002 0.23099995 -0.50600004 0.23099995 -0.78100014 c 0 -0.5719999 -0.21999979 -1.0669999 -0.671 -1.4739999 c -0.45099974 -0.40700006 -0.9569998 -0.605 -1.54 -0.605 h -1.4849999 c -0.11000013 0 -0.18700004 0 -0.23099995 0.011000007 c -0.06600022 0 -0.099000216 0.022000015 -0.099000216 0.055000007 c 0 0.010999978 0 0.04399997 0.011000156 0.088 c 0.34099984 1.3970001 0.605 2.453 0.7809999 3.157 h 2.024 c 0.47300005 0 0.7920003 -0.15400004 0.9790001 -0.45099998 Z \"\/><\/symbol><\/defs><\/svg><\/span> et <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 0.9089999999999999em; height: 0.683em;\" viewBox=\"0 0 9.998999999999999 7.513000000000001\" width=\"9.998999999999999pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 0 7.513000000000001)\"><use xlink:href=\"#gB149A0570E9E9B873E3CBD8CA9731282\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><\/g><defs id=\"glyph\"><symbol id=\"gB149A0570E9E9B873E3CBD8CA9731282\" overflow=\"visible\"><path d=\"M 0 0m 9.691 7.348 c 0 0.11000013 -0.065999985 0.16499996 -0.19799995 0.16499996 l -1.3970003 -0.032999992 l -1.3969998 0.032999992 c -0.17600012 0 -0.25299978 -0.09899998 -0.25299978 -0.26399994 c 0 -0.07700014 0.032999992 -0.13199997 0.08799982 -0.14300013 c 0.11000013 -0.011000156 0.19799995 -0.021999836 0.25300026 -0.021999836 c 0.3409996 -0.011000156 0.5279999 -0.032999992 0.5829997 -0.04400015 c 0.055000305 -0.011000156 0.0880003 -0.04400015 0.0880003 -0.09899998 c -0.011000156 -0.032999992 -0.022000313 -0.09899998 -0.04400015 -0.19799995 l -0.64900017 -2.618 h -3.234 l 0.63800025 2.4969997 c 0.05499983 0.23100042 0.1539998 0.37400007 0.29699993 0.42900038 c 0.076999664 0.021999836 0.26399994 0.032999992 0.572 0.032999992 c 0.29699993 0 0.41799974 0 0.41799974 0.26399994 c 0 0.11000013 -0.065999985 0.16499996 -0.19799995 0.16499996 l -1.3969998 -0.032999992 l -1.408 0.032999992 c -0.17600012 0 -0.25300002 -0.09899998 -0.25300002 -0.26399994 c 0 -0.07700014 0.032999992 -0.13199997 0.09899998 -0.14300013 c 0.109999895 -0.011000156 0.19799995 -0.021999836 0.25300002 -0.021999836 c 0.34099984 -0.011000156 0.53900003 -0.032999992 0.59399986 -0.04400015 c 0.055000067 -0.011000156 0.07700014 -0.04400015 0.07700014 -0.09899998 c 0 -0.021999836 -0.011000156 -0.08799982 -0.04400015 -0.19799995 l -1.4629999 -5.841 c -0.054999948 -0.24200004 -0.16499996 -0.385 -0.32999992 -0.44 c -0.07700002 -0.022000015 -0.2750001 -0.033000022 -0.61600006 -0.033000022 c -0.24199998 0 -0.341 -0.021999985 -0.341 -0.264 c 0 -0.10999999 0.066000015 -0.16499999 0.19799998 -0.16499999 l 1.386 0.033 l 0.6930001 -0.011 c 0.12099981 0 0.58299994 -0.022 0.704 -0.022 c 0.17599988 0 0.26399994 0.088 0.26399994 0.264 c 0 0.110000014 -0.12100005 0.16499999 -0.352 0.16499999 c -0.44000006 0 -0.6600001 0.044 -0.6600001 0.14300004 c 0 0 0.011000156 0.032999992 0.032999992 0.176 l 0.737 2.948 h 3.2229998 l -0.737 -2.948 c -0.032999992 -0.16500002 -0.16499996 -0.27500004 -0.38499975 -0.30800003 c -0.05499983 -0.011000007 -0.2420001 -0.011000007 -0.5609999 -0.011000007 c -0.20900011 0 -0.3080001 -0.088 -0.3080001 -0.264 c 0 -0.10999999 0.065999985 -0.16499999 0.19799995 -0.16499999 l 1.3860002 0.033 l 0.69299984 -0.011 c 0.12099981 0 0.572 -0.022 0.71500015 -0.022 c 0.17599964 0 0.26399994 0.088 0.26399994 0.264 c 0 0.110000014 -0.12100029 0.16499999 -0.35200024 0.16499999 c -0.45099974 0 -0.671 0.044 -0.671 0.14300004 c 0 0 0.011000156 0.032999992 0.032999992 0.176 l 1.4740005 5.8739996 c 0.05499935 0.23100042 0.15399933 0.37400007 0.29699993 0.42900038 c 0.065999985 0.021999836 0.2529993 0.032999992 0.57199955 0.032999992 c 0.28600025 0 0.41800022 0 0.41800022 0.26399994 Z \"\/><\/symbol><\/defs><\/svg><\/span> dans un mat\u00e9riau doux ?\n  <\/li>\n<li>\n    La surface d\u2019une spire est orient\u00e9e selon <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 0.9028em; height: 0.683em;\" viewBox=\"0 0 9.930800000000001 7.513000000000001\" width=\"9.930800000000001pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 6.203999999999999 7.513000000000001)\"><use xlink:href=\"#g154417F8EB280D42CEBBAAD30AD86F5A\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 0 7.513000000000001)\"><use xlink:href=\"#g543F1B23C3C5D6AB685534F28A2D6B23\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 5.126 10.23)\"><use xlink:href=\"#g1CAA023266AABB43FAA354DEEA1603D2\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><\/g><defs id=\"glyph\"><symbol id=\"g154417F8EB280D42CEBBAAD30AD86F5A\" overflow=\"visible\"><path d=\"M 0 0m -0.759 6.5889997 c 0.09900004 0.032999992 0.143 0.0880003 0.143 0.18700027 c 0 0.09899998 -0.04399997 0.1539998 -0.143 0.1869998 c -0.39599997 0.13199997 -0.682 0.37400007 -0.858 0.737 c -0.032999992 0.07700014 -0.09899998 0.12100029 -0.176 0.12100029 c -0.143 0 -0.20900011 -0.065999985 -0.20900011 -0.19799995 c 0 -0.16499996 0.14300013 -0.38500023 0.42900014 -0.64900017 h -3.4099998 c -0.14300013 0 -0.20900011 -0.065999985 -0.20900011 -0.19799995 c 0 -0.13199997 0.065999985 -0.19799995 0.20900011 -0.19799995 h 3.4099998 c -0.286 -0.26399994 -0.42900014 -0.4840002 -0.42900014 -0.64900017 c 0 -0.13199997 0.066000104 -0.19799995 0.20900011 -0.19799995 c 0.07700002 0 0.143 0.04400015 0.176 0.12099981 c 0.176 0.3630004 0.462 0.605 0.858 0.737 Z \"\/><\/symbol><symbol id=\"g543F1B23C3C5D6AB685534F28A2D6B23\" overflow=\"visible\"><path d=\"M 0 0m 1.364 1.419 c 0 0.26399994 0.055000067 0.627 0.16500008 1.078 h 0.53900003 c 0.7149999 0 1.2649999 0.08800006 1.661 0.25300002 c 0.36299992 0.15400004 0.605 0.37400007 0.72599983 0.6489999 c 0.07700014 0.18700004 0.11000013 0.36300015 0.11000013 0.50600004 c 0 0.6049998 -0.572 0.957 -1.188 0.957 c -0.42900014 0 -0.85800004 -0.11000013 -1.2870002 -0.32999992 c -0.8469999 -0.44000006 -1.5839999 -1.441 -1.5839999 -2.651 c 0 -1.122 0.649 -2.002 1.7379999 -2.002 c 0.58299994 0 1.0999999 0.143 1.5510001 0.41799998 c 0.37400007 0.231 0.6489997 0.462 0.8249998 0.693 c 0.07700014 0.09899998 0.11000013 0.176 0.11000013 0.20899999 c 0 0.12099993 -0.05499983 0.18700004 -0.17600012 0.18700004 c -0.05499983 0 -0.11000013 -0.04400003 -0.17600012 -0.13200009 c -0.36299992 -0.48399997 -0.8139999 -0.79199994 -1.3309999 -0.92399997 c -0.34099984 -0.087999985 -0.59399986 -0.13199998 -0.7809999 -0.13199998 c -0.6270001 0 -0.90200007 0.594 -0.90200007 1.2210001 Z m 2.7610002 2.486 c 0 -0.7260001 -0.704 -1.089 -2.123 -1.089 h -0.3850001 c 0.20899999 0.7260001 0.5170001 1.21 0.93500006 1.441 c 0.32999992 0.1869998 0.605 0.28599977 0.82500005 0.28599977 c 0.3959999 0 0.7479999 -0.24199963 0.7479999 -0.6379998 Z \"\/><\/symbol><symbol id=\"g1CAA023266AABB43FAA354DEEA1603D2\" overflow=\"visible\"><path d=\"M 0 0m 1.5631 -0.077 c 0.37730002 0 0.7545999 0.20019999 1.1319 0.6006 c 0.64680004 0.6776 1.2397001 1.9557999 1.2397001 3.2108998 c 0 0.42350006 -0.07700014 0.7930999 -0.22329998 1.0934 c -0.19250011 0.3927002 -0.47740006 0.5929003 -0.8547001 0.5929003 c -0.37730002 0 -0.75460005 -0.20020008 -1.1319 -0.5929003 c -0.64680004 -0.6775999 -1.2397 -1.9635 -1.2397 -3.2185998 c 0 -0.8547 0.31569996 -1.6863 1.078 -1.6863 Z m 1.2936 5.2206 c 0.30030012 0 0.44659996 -0.31570005 0.44659996 -0.9548001 c 0 -0.32339978 -0.06929994 -0.77 -0.20789981 -1.3474998 h -1.6863002 c 0.1925 0.7853999 0.7392 2.3023 1.4476 2.3023 Z m -1.5323 -2.6411 h 1.6863 c -0.16939998 -0.6622001 -0.36960006 -1.1858001 -0.6006 -1.5631001 c -0.29259992 -0.49280003 -0.5775 -0.7392 -0.847 -0.7392 c -0.3003 0 -0.44659996 0.31570002 -0.44659996 0.9548 c 0 0.36960006 0.06929994 0.8162 0.20789993 1.3475001 Z \"\/><\/symbol><\/defs><\/svg><\/span>.\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    La m\u00e9thode est tr\u00e8s similaire \u00e0 la question pr\u00e9c\u00e9dente.\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    Utiliser la loi de Faraday.\n  <\/li>\n<li>\n    Repr\u00e9senter le sch\u00e9ma \u00e9lectrique \u00e9quivalent.\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    Passer l\u2019\u00e9quation diff\u00e9rentielle en complexes.\n  <\/li>\n<li>\n    <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 0.572em; height: 0.683em;\" viewBox=\"0 0 6.292 7.513000000000001\" width=\"6.292pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 0 7.513000000000001)\"><use xlink:href=\"#g47213F35E5BB4F00D50B1DDAD773B320\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><\/g><defs id=\"glyph\"><symbol id=\"g47213F35E5BB4F00D50B1DDAD773B320\" overflow=\"visible\"><path d=\"M 0 0m 5.973 1.584 c 0 0.09899998 -0.055000305 0.15400004 -0.17600012 0.15400004 c -0.09899998 0 -0.1539998 -0.07700002 -0.1869998 -0.23100007 c -0.055000305 -0.20899999 -0.11000013 -0.41799998 -0.18700027 -0.627 c -0.14300013 -0.451 -0.34100008 -0.682 -0.5829997 -0.682 c -0.19799995 0 -0.2970004 0.154 -0.2970004 0.46199995 c 0 0.18700004 0.07700014 0.561 0.22000027 1.1110001 l 0.29699993 1.166 c 0.09899998 0.3959999 0.1869998 0.671 0.25300026 1.0119998 l 0.065999985 0.29699993 c 0.021999836 0.07700014 0.032999992 0.13199997 0.032999992 0.16499996 c 0 0.22000027 -0.12100029 0.3300004 -0.3630004 0.3300004 c -0.24199963 0 -0.3959999 -0.13199997 -0.4619999 -0.40700006 l -0.8139999 -3.256 c -0.010999918 -0.032999992 -0.055000067 -0.109999955 -0.14300013 -0.24199998 c -0.17599988 -0.28599995 -0.6049998 -0.63799995 -1.0449998 -0.63799995 c -0.41799998 0 -0.6270001 0.286 -0.6270001 0.84699994 c 0 0.4510001 0.19799995 1.1769999 0.58299994 2.1890001 c 0.12100005 0.32999992 0.18700004 0.5610001 0.18700004 0.6930001 c 0 0.5499997 -0.385 0.93499994 -0.93499994 0.93499994 c -0.495 0 -0.88 -0.2750001 -1.155 -0.8249998 c -0.20900002 -0.42900014 -0.319 -0.7260003 -0.319 -0.8800001 c 0 -0.09899998 0.055000007 -0.15400004 0.176 -0.15400004 c 0.143 0 0.16499996 0.065999985 0.20899999 0.22000003 c 0.25300002 0.8800001 0.605 1.3199997 1.056 1.3199997 c 0.15400004 0 0.23099995 -0.10999966 0.23099995 -0.31899977 c 0 -0.16499996 -0.065999985 -0.3959999 -0.18699992 -0.7149999 c -0.41799998 -1.1110001 -0.627 -1.881 -0.627 -2.288 c 0 -0.84699994 0.528 -1.342 1.375 -1.342 c 0.47300005 0 0.90199995 0.22 1.2649999 0.671 c 0.15400004 -0.451 0.4840002 -0.671 0.99000025 -0.671 c 0.7589998 0 0.9899998 0.891 1.1659999 1.705 Z \"\/><\/symbol><\/defs><\/svg><\/span> est proportionnel \u00e0 <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 0.525em; height: 0.683em;\" viewBox=\"0 0 5.775 7.513000000000001\" width=\"5.775pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 0 7.513000000000001)\"><use xlink:href=\"#gCCF9CCFF957488E5A0460D14888408A3\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><\/g><defs id=\"glyph\"><symbol id=\"gCCF9CCFF957488E5A0460D14888408A3\" overflow=\"visible\"><path d=\"M 0 0m 5.467 7.337 c 0 0.12100029 -0.065999985 0.17600012 -0.20900011 0.17600012 l -1.4189999 -0.032999992 l -1.441 0.032999992 c -0.17600012 0.011000156 -0.26399994 -0.07700014 -0.26399994 -0.26399994 c 0 -0.11000013 0.12099981 -0.16499996 0.352 -0.16499996 c 0.4729998 0 0.704 -0.055000305 0.704 -0.15400028 c 0 -0.05499983 -0.011000156 -0.10999966 -0.022000074 -0.16499996 l -1.4629999 -5.863 c -0.055000067 -0.24200004 -0.16500008 -0.385 -0.33000004 -0.44 c -0.07700002 -0.022000015 -0.27499998 -0.033000022 -0.616 -0.033000022 c -0.275 0 -0.385 -0.011000007 -0.385 -0.264 c 0 -0.10999999 0.065999985 -0.16499999 0.20899999 -0.16499999 l 1.408 0.033 l 1.4520001 -0.033 c 0.17599988 -0.011 0.26399994 0.077 0.26399994 0.253 c 0 0.176 -0.13199997 0.176 -0.37400007 0.176 c -0.4289999 0 -0.6930001 -0.021999985 -0.6930001 0.15400001 c 0 0.055000007 0.011000156 0.13199997 0.04400015 0.24199998 l 1.4520001 5.797 c 0.05499983 0.23100042 0.16499996 0.37400007 0.32999992 0.42900038 c 0.076999664 0.021999836 0.2750001 0.032999992 0.6159997 0.032999992 c 0.26400042 0 0.38500023 0.01099968 0.38500023 0.25299978 Z \"\/><\/symbol><\/defs><\/svg><\/span> si la fonction de transfert est ind\u00e9pendante de <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 0.518em; height: 0.683em;\" viewBox=\"0 0 5.698 7.513000000000001\" width=\"5.698pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 0 7.513000000000001)\"><use xlink:href=\"#g3F95EDCC86DD7C368576737ECF47448D\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><\/g><defs id=\"glyph\"><symbol id=\"g3F95EDCC86DD7C368576737ECF47448D\" overflow=\"visible\"><path d=\"M 0 0m 3.905 4.862 c -0.48399997 0 -0.9460001 -0.25299978 -1.3970001 -0.7589998 c -0.12099981 0.50600004 -0.4619999 0.7589998 -1.0009999 0.7589998 c -0.45099998 0 -0.78099996 -0.36299992 -1.012 -1.0780001 c -0.110000014 -0.36299992 -0.16500002 -0.572 -0.16500002 -0.638 c 0 -0.09899998 0.055000007 -0.1539998 0.176 -0.1539998 c 0.055000007 0 0.088 0.010999918 0.12099999 0.032999992 c 0.055000007 0.09899998 0.088 0.17599988 0.09900004 0.25299978 c 0.19800001 0.83599997 0.45100003 1.2540002 0.74799997 1.2540002 c 0.19799995 0 0.29700005 -0.15400028 0.29700005 -0.4510002 c 0 -0.16499996 -0.022000074 -0.35199976 -0.07700002 -0.54999995 l -1.21 -4.829 c -0.09900001 -0.36300004 -0.109999985 -0.40700006 -0.539 -0.40700006 c -0.19799998 0 -0.297 -0.08799994 -0.297 -0.2529999 c 0 -0.12100005 0.065999985 -0.17600012 0.187 -0.17600012 c 0.16499999 0 0.737 0.032999992 0.90199995 0.032999992 c 0.20899999 0 0.86899996 -0.032999992 1.078 -0.032999992 c 0.16500008 0 0.24199998 0.08800006 0.24199998 0.26400006 c 0 0.110000014 -0.09899998 0.16499996 -0.30799997 0.16499996 c -0.19799995 0 -0.495 -0.010999918 -0.495 0.12100005 c 0 0.143 0.4510001 1.87 0.495 2.057 c 0.22000003 -0.407 0.5500001 -0.616 0.9900001 -0.616 c 0.7149999 0 1.3419998 0.363 1.892 1.1 c 0.50600004 0.671 0.7589998 1.3859999 0.7589998 2.123 c 0 0.95700026 -0.572 1.7820001 -1.4849999 1.7820001 Z m -0.032999992 -0.32999992 c 0.42900014 0 0.6489999 -0.32999992 0.6489999 -0.9790001 c 0 -0.29699993 -0.065999985 -0.6930001 -0.1869998 -1.188 c -0.25300026 -0.957 -0.572 -1.584 -0.957 -1.903 c -0.23100019 -0.187 -0.44000006 -0.286 -0.64900017 -0.286 c -0.319 0 -0.53900003 0.143 -0.65999985 0.44 c -0.0990001 0.231 -0.15400004 0.39599997 -0.15400004 0.48400003 l 0.5609999 2.2989998 c 0.055000067 0.2420001 0.25300002 0.49500012 0.5610001 0.7479999 c 0.30799985 0.25300026 0.58299994 0.38500023 0.83599997 0.38500023 Z \"\/><\/symbol><\/defs><\/svg><\/span>.\n  <\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h5>Exercice 2<\/h5>\n<ol>\n<li>\n<ul>\n<li>\n    Le cycle d\u2019hyst\u00e9r\u00e9sis doit-il \u00eatre fin ou \u00e9pais ?\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    Relier <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; 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Que vaut la perm\u00e9abilit\u00e9 magn\u00e9tique du mat\u00e9riau doux ?\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    Utiliser la conservation du flux de <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 0.784em; height: 0.683em;\" viewBox=\"0 0 8.624 7.513000000000001\" width=\"8.624pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 8.338 4.95)\"><use xlink:href=\"#g154417F8EB280D42CEBBAAD30AD86F5A\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 0 7.513000000000001)\"><use xlink:href=\"#g3E995207BA930C94107C99A15339EEAD\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><\/g><defs id=\"glyph\"><symbol id=\"g154417F8EB280D42CEBBAAD30AD86F5A\" overflow=\"visible\"><path d=\"M 0 0m -0.759 6.5889997 c 0.09900004 0.032999992 0.143 0.0880003 0.143 0.18700027 c 0 0.09899998 -0.04399997 0.1539998 -0.143 0.1869998 c -0.39599997 0.13199997 -0.682 0.37400007 -0.858 0.737 c -0.032999992 0.07700014 -0.09899998 0.12100029 -0.176 0.12100029 c -0.143 0 -0.20900011 -0.065999985 -0.20900011 -0.19799995 c 0 -0.16499996 0.14300013 -0.38500023 0.42900014 -0.64900017 h -3.4099998 c -0.14300013 0 -0.20900011 -0.065999985 -0.20900011 -0.19799995 c 0 -0.13199997 0.065999985 -0.19799995 0.20900011 -0.19799995 h 3.4099998 c -0.286 -0.26399994 -0.42900014 -0.4840002 -0.42900014 -0.64900017 c 0 -0.13199997 0.066000104 -0.19799995 0.20900011 -0.19799995 c 0.07700002 0 0.143 0.04400015 0.176 0.12099981 c 0.176 0.3630004 0.462 0.605 0.858 0.737 Z \"\/><\/symbol><symbol id=\"g3E995207BA930C94107C99A15339EEAD\" overflow=\"visible\"><path d=\"M 0 0m 8.316 5.973 c 0 1.0009999 -0.99000025 1.54 -2.0679998 1.54 h -3.6520002 c -0.25300002 0 -0.36299992 -0.011000156 -0.36299992 -0.26399994 c 0 -0.17600012 0.22000003 -0.16499996 0.352 -0.16499996 c 0.32999992 -0.011000156 0.5279999 -0.032999992 0.58299994 -0.04400015 c 0.055000067 -0.011000156 0.0769999 -0.04400015 0.0769999 -0.09899998 c 0 -0.021999836 -0.010999918 -0.08799982 -0.04399991 -0.19799995 l -1.452 -5.841 c -0.054999948 -0.24200004 -0.16499996 -0.385 -0.32999992 -0.44 c -0.07700002 -0.022000015 -0.27499998 -0.033000022 -0.61600006 -0.033000022 c -0.23099995 0 -0.34099996 -0.088 -0.34099996 -0.264 c 0 -0.10999999 0.110000014 -0.16499999 0.34099996 -0.16499999 h 3.883 c 0.71500015 0 1.375 0.22 2.0019999 0.649 c 0.6930003 0.473 1.0450001 1.056 1.0450001 1.7380002 c 0 0.86899996 -0.7149997 1.3969998 -1.4959998 1.5509999 c 0.96799994 0.23100019 2.079 0.9680002 2.079 2.035 Z m -2.2220001 1.1110001 c 0.7590003 0 1.144 -0.35200024 1.144 -1.0669999 c 0 -0.56100035 -0.21999979 -1.0230002 -0.68200016 -1.3970003 c -0.4619999 -0.37400007 -0.9789996 -0.5499997 -1.54 -0.5499997 h -1.5289998 l 0.65999985 2.6399999 c 0.0880003 0.37400007 0.0880003 0.37400007 0.5500002 0.37400007 Z m 0.3080001 -3.795 c 0.1539998 -0.25300002 0.23099995 -0.50600004 0.23099995 -0.78100014 c 0 -0.5719999 -0.21999979 -1.0669999 -0.671 -1.4739999 c -0.45099974 -0.40700006 -0.9569998 -0.605 -1.54 -0.605 h -1.4849999 c -0.11000013 0 -0.18700004 0 -0.23099995 0.011000007 c -0.06600022 0 -0.099000216 0.022000015 -0.099000216 0.055000007 c 0 0.010999978 0 0.04399997 0.011000156 0.088 c 0.34099984 1.3970001 0.605 2.453 0.7809999 3.157 h 2.024 c 0.47300005 0 0.7920003 -0.15400004 0.9790001 -0.45099998 Z \"\/><\/symbol><\/defs><\/svg><\/span> sur une petite surface \u00e0 cheval sur l\u2019interface.\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    Quel est le courant enlac\u00e9 par la ligne de champ moyenne ?\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    La relation de la question pr\u00e9c\u00e9dente est une fonction lin\u00e9aire. La repr\u00e9senter graphiquement sur le cycle d\u2019hyst\u00e9r\u00e9sis.\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    Lire graphiquement les intersections entre le cycle d\u2019hyst\u00e9r\u00e9sis et la droite trac\u00e9e pr\u00e9c\u00e9demment.\n  <\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h5>Exercice 3<\/h5>\n<ol>\n<li>\n<ul>\n<li>\n    Faire le lien entre l\u2019hyst\u00e9r\u00e9sis et la notion de m\u00e9moire du mat\u00e9riau.\n  <\/li>\n<li>\n    Faire le lien avec les aimants du quotidien (aimant de r\u00e9frig\u00e9rateur, boussole\u2026).\n  <\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h5>Exercice 4<\/h5>\n<ol>\n<li>\n<ul>\n<li>\n    Faire l\u2019inventaire des moments s\u2019exer\u00e7ants sur l\u2019aiguille de la boussole.\n  <\/li>\n<li>\n    Rappeler l\u2019expression du TMC (dans sa version en rotation autour d\u2019un axe fixe).\n  <\/li>\n<li>\n    Montrer que l\u2019\u00e9quation diff\u00e9rentielle r\u00e9gissant le mouvement de l\u2019aiguille est celle d\u2019un oscillateur harmonique et donner l\u2019expression de la p\u00e9riode des oscillations.\n  <\/li>\n<li>\n    La vid\u00e9o permet d\u2019estimer la p\u00e9riode des oscillations. En d\u00e9duire le moment magn\u00e9tique de la boussole.\n  <\/li>\n<\/ul>\n<\/li>\n<\/ol><\/div>\n","protected":false},"excerpt":{"rendered":"<p>T\u00e9l\u00e9chargements Polycopi\u00e9 Flashcards Anki Coups de pouce Laisser la souris\/taper sur le texte pour l&rsquo;afficher. Exercice 1 Effectuer les 4 \u00e9tapes : analyse de invariances, des sym\u00e9tries, choix de la courbe d\u2019Amp\u00e8re et th\u00e9or\u00e8me d\u2019Amp\u00e8re (dans un milieu magn\u00e9tique). Sur&hellip;<\/p>\n<p class=\"more-link-p\"><a class=\"more-link\" href=\"https:\/\/www.cpge-brizeux.fr\/wordpress\/psi\/physchim-psi-2526\/electromagnetisme-4-materiaux-ferromagnetiques.html\">Read more &rarr;<\/a><\/p>\n","protected":false},"author":26,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[430],"tags":[],"class_list":["post-37066","post","type-post","status-publish","format-standard","hentry","category-physchim-psi-2526"],"_links":{"self":[{"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/posts\/37066","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/users\/26"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/comments?post=37066"}],"version-history":[{"count":2,"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/posts\/37066\/revisions"}],"predecessor-version":[{"id":37117,"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/posts\/37066\/revisions\/37117"}],"wp:attachment":[{"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/media?parent=37066"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/categories?post=37066"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/tags?post=37066"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}