{"id":1864,"date":"2026-07-26T20:32:22","date_gmt":"2026-07-26T11:32:22","guid":{"rendered":"https:\/\/daba-no-heya.com\/?p=1864"},"modified":"2026-07-26T20:32:23","modified_gmt":"2026-07-26T11:32:23","slug":"post-1864","status":"publish","type":"post","link":"https:\/\/daba-no-heya.com\/?p=1864","title":{"rendered":"\u30af\u30fc\u30ed\u30f3\u306e\u6cd5\u5247"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/daba-no-heya.com\/?p=1864\/#%E3%82%AF%E3%83%BC%E3%83%AD%E3%83%B3%E3%81%AE%E6%B3%95%E5%89%87\" >\u30af\u30fc\u30ed\u30f3\u306e\u6cd5\u5247<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/daba-no-heya.com\/?p=1864\/#%E3%82%AF%E3%83%BC%E3%83%AD%E3%83%B3%E3%83%9D%E3%83%86%E3%83%B3%E3%82%B7%E3%83%A3%E3%83%AB\" >\u30af\u30fc\u30ed\u30f3\u30dd\u30c6\u30f3\u30b7\u30e3\u30eb<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%82%AF%E3%83%BC%E3%83%AD%E3%83%B3%E3%81%AE%E6%B3%95%E5%89%87\"><\/span>\u30af\u30fc\u30ed\u30f3\u306e\u6cd5\u5247<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">$q_1$\u3068$q_2$\u306e\u96fb\u8377\u3092\u3082\u3064\u3001\u8ddd\u96e2$r$\u3060\u3051\u96e2\u308c\u305f\u4e8c\u3064\u306e\u70b9\u96fb\u8377\u306b\u3064\u3044\u3066\u3001\u4e21\u8005\u306e\u9593\u306b\u50cd\u304f\u529b\u306e\u5927\u304d\u3055$F$\u306f\u3001<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$$<br>\nF=k\\frac{|q_1||q_2|}{r^2}\n<br>$$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3068\u8868\u3055\u308c\u307e\u3059\u3002<br>\u3053\u3053\u306b\u767b\u5834\u3059\u308b\u4fc2\u6570$k$\u306f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$$<br>\nk=\\frac{1}{4\\pi\\epsilon_0}\n<br>$$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3067\u3001$\\epsilon_0$\u306f\u771f\u7a7a\u306e\u8a98\u96fb\u7387\u3067\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"532\" height=\"267\" src=\"https:\/\/daba-no-heya.com\/wp-content\/uploads\/2026\/07\/\u30af\u30fc\u30ed\u30f3\u306e\u6cd5\u5247.png\" alt=\"\" class=\"wp-image-1868\" srcset=\"https:\/\/daba-no-heya.com\/wp-content\/uploads\/2026\/07\/\u30af\u30fc\u30ed\u30f3\u306e\u6cd5\u5247.png 532w, https:\/\/daba-no-heya.com\/wp-content\/uploads\/2026\/07\/\u30af\u30fc\u30ed\u30f3\u306e\u6cd5\u5247-300x151.png 300w\" sizes=\"auto, (max-width: 532px) 100vw, 532px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%82%AF%E3%83%BC%E3%83%AD%E3%83%B3%E3%83%9D%E3%83%86%E3%83%B3%E3%82%B7%E3%83%A3%E3%83%AB\"><\/span>\u30af\u30fc\u30ed\u30f3\u30dd\u30c6\u30f3\u30b7\u30e3\u30eb<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30fc\u30ed\u30f3\u30dd\u30c6\u30f3\u30b7\u30e3\u30eb\u306f\u3001\u30af\u30fc\u30ed\u30f3\u529b\u306b\u3088\u3063\u3066\u96fb\u8377\u304c\u3082\u3064\u4f4d\u7f6e\u30a8\u30cd\u30eb\u30ae\u30fc\u3067\u3059\u3002<br>\u4ee5\u524d\u306e\u8a18\u4e8b(<a href=\"https:\/\/daba-no-heya.com\/?p=1632\" data-type=\"post\" data-id=\"1632\">\u91cd\u529b\u30dd\u30c6\u30f3\u30b7\u30e3\u30eb\u3068\u30dd\u30a2\u30bd\u30f3\u65b9\u7a0b\u5f0f<\/a>)\u3067\u3001\u4f4d\u7f6e\u30a8\u30cd\u30eb\u30ae\u30fc$U(\\boldsymbol{r})$\u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$$<br>\nU(\\boldsymbol{r})=-\\int_{\\boldsymbol{r_0}}^\\boldsymbol{r}\\boldsymbol{F}\\cdot d\\boldsymbol{r&#8217;}\n<br>$$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u5b9a\u7fa9\u3092\u7528\u3044\u3066\u3001\u70b9\u96fb\u8377\u306e\u4f5c\u308b\u30af\u30fc\u30ed\u30f3\u30dd\u30c6\u30f3\u30b7\u30e3\u30eb\u3092\u8a08\u7b97\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u70b9\u96fb\u8377\u306e\u4f5c\u308b\u30dd\u30c6\u30f3\u30b7\u30e3\u30eb\u306f\u7403\u5bfe\u79f0\u306a\u306e\u3067\u3001\u539f\u70b9\u304b\u3089\u306e\u8ddd\u96e2\u304c\u308f\u304b\u308c\u3070\u3044\u3044\u3067\u3059\u3002<br>\u3053\u306e\u305f\u3081\u3001$r=|\\boldsymbol{r}|$\u306e\u3088\u3046\u306b\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$\\boldsymbol{r_0}$\u304b\u3089$\\boldsymbol{r}$\u307e\u3067\u306e\u7dda\u7a4d\u5206\u3067\u3059\u304c\u3001\u30af\u30fc\u30ed\u30f3\u529b\u306f\u4fdd\u5b58\u529b\u306a\u306e\u3067\u3001$\\boldsymbol{r_0}$\u304b\u3089$\\boldsymbol{r}$\u307e\u3067\u76f4\u7dda\u3067\u5411\u304b\u3046\u7d4c\u8def\u3092\u3068\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002<br>\u3053\u306e\u5834\u5408\u3001\u30af\u30fc\u30ed\u30f3\u529b$\\boldsymbol{F}$\u3068\u7a4d\u5206\u306e\u65b9\u5411$d\\boldsymbol{r&#8217;}$\u306f\u540c\u3058\u5411\u304d\u306a\u306e\u3067\u3001$\\boldsymbol{F}\\cdot d\\boldsymbol{r&#8217;}=Fdr&#8217;$\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$U(r)$\u3092\u8a08\u7b97\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$$<br>\n\\begin{align}\nU(r)&amp;=-\\int_{r_0}^r Fdr&#8217; \\\\\n&amp;=-\\int_{r_0}^r\\frac{1}{4\\pi\\epsilon_0}\\frac{q_1q_2}{{r&#8217;}^2}dr&#8217; \\\\\n&amp;=-\\frac{q_1q_2}{4\\pi\\epsilon_0}\\int_{r_0}^r\\frac{dr&#8217;}{{r&#8217;}^2} \\\\\n&amp;=-\\frac{q_1q_2}{4\\pi\\epsilon_0}\\left[ -\\frac{1}{r&#8217;} \\right]_{r_0}^r \\\\\n&amp;=-\\frac{q_1q_2}{4\\pi\\epsilon_0}\\left( -\\frac{1}{r}+\\frac{1}{r_0} \\right)\n\\end{align}\n<br>$$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u57fa\u6e96\u70b9$r_0$\u3092\u7121\u9650\u9060\u306b\u3068\u308b\u3068\u3001<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$$<br>\nU(r)=\\frac{q_1q_2}{4\\pi\\epsilon_0}\\frac{1}{r}\n<br>$$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30af\u30fc\u30ed\u30f3\u306e\u6cd5\u5247 $q_1$\u3068$q_2$\u306e\u96fb\u8377\u3092\u3082\u3064\u3001\u8ddd\u96e2$r$\u3060\u3051\u96e2\u308c\u305f\u4e8c\u3064\u306e\u70b9\u96fb\u8377\u306b\u3064\u3044\u3066\u3001\u4e21\u8005\u306e\u9593\u306b\u50cd\u304f\u529b\u306e\u5927\u304d\u3055$F$\u306f\u3001 $$ F=k\\frac{|q_1||q_2|}{r^2} $$ \u3068\u8868\u3055\u308c\u307e\u3059\u3002\u3053\u3053\u306b\u767b\u5834\u3059 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-1864","post","type-post","status-publish","format-standard","hentry","category-9"],"_links":{"self":[{"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=\/wp\/v2\/posts\/1864","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1864"}],"version-history":[{"count":4,"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=\/wp\/v2\/posts\/1864\/revisions"}],"predecessor-version":[{"id":1870,"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=\/wp\/v2\/posts\/1864\/revisions\/1870"}],"wp:attachment":[{"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1864"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1864"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1864"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}