{"id":51654,"date":"2025-09-06T18:10:26","date_gmt":"2025-09-06T09:10:26","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=51654"},"modified":"2025-09-06T18:10:26","modified_gmt":"2025-09-06T09:10:26","slug":"exam-alert-electrostatic-induction-grounding-made-easy-5-steps-with-the-gold-leaf-electroscope","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=51654&lang=en","title":{"rendered":"Exam Alert! Electrostatic Induction &#038; Grounding Made Easy \u2014 5 Steps with the Gold-Leaf Electroscope"},"content":{"rendered":"<p> Hi, I&#8217;m Ken Kuwako, a science trainer. Every day is an experiment!  <\/p>\n<p>The gold-leaf electroscope experiment is a great way to visualize the invisible movements of electricity, but it&#8217;s not always easy to wrap your head around, is it? Static electricity is something we&#8217;ve all experienced\u2014the crackle when you take off a sweater in elementary school, or making your hair stand on end with a ruler. Yet, it&#8217;s hard to accurately imagine how the &#8220;electrons,&#8221; which are the very essence of electricity, move because you can&#8217;t see them.<\/p>\n<p><iframe loading=\"lazy\" title=\"\u9759\u96fb\u6c17\u3092\u691c\u51fa\u3059\u308b\u7b94\u691c\u96fb\u5668\u306e\u4e0d\u601d\u8b70\u3010\u79d1\u5b66\u306e\u30cd\u30bf\u5e33\u3011\" width=\"1140\" height=\"641\" src=\"https:\/\/www.youtube.com\/embed\/T4-0f9Fh9Ro?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>It&#8217;s almost like trying to decipher words written in invisible ink.<\/p>\n<p>But don&#8217;t worry! We&#8217;ll carefully track the movement of those invisible electrons and demystify the mechanisms of &#8220;electrostatic induction&#8221; and &#8220;grounding&#8221;\u2014two key concepts in high school physics. By mastering this experiment, you&#8217;ll gain a much deeper understanding of the entire field of electricity! So, let&#8217;s take on the challenge and solve the mystery of electricity together.<\/p>\n<p>Problem<br \/>\nAs shown in the diagram below, a positively charged glass rod is brought close to the metal plate of a gold-leaf electroscope, causing electrons to move and the leaves to spread apart (\u2461). When a finger touches the metal plate while the rod is still there, the leaves close (\u2462). After the finger is removed (\u2463), the glass rod is taken away (\u2464), and the leaves open again. Considering the state of the electrons during this process, draw the electron distribution for diagrams \u2462 through \u2464.<\/p>\n<p><a href=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/8b346b4cebc6a34919686ba2aa5ed05c.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-21474 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/8b346b4cebc6a34919686ba2aa5ed05c-300x291.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2015-04-13 23.58.52\" width=\"300\" height=\"291\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/8b346b4cebc6a34919686ba2aa5ed05c-300x291.png 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/8b346b4cebc6a34919686ba2aa5ed05c.png 493w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Answer and Explanation<br \/>\nInside the metal plate and leaves are a multitude of &#8220;free electrons&#8221; that can move freely and conduct electricity. As shown in diagram \u2460, when there is no charge, the electrons are evenly distributed, and the electroscope is electrically neutral (zero charge). In diagram \u2460, the electron distribution inside the leaves is shown for clarity. When a positively charged glass rod is brought near, the free electrons in the metal plate and leaves are attracted to the rod&#8217;s positive charge and move upwards. This is what&#8217;s happening from \u2460 to \u2461.<\/p>\n<p><a href=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/a50d31f6ec6a1d39ac6364457e9f6ea3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-21475 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/a50d31f6ec6a1d39ac6364457e9f6ea3.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2015-04-13 23.59.17\" width=\"203\" height=\"175\" \/><\/a><\/p>\n<p>As a result of the electrons moving to the top, the leaves become relatively positively charged and repel each other, causing them to spread apart. This is why the device is called an &#8220;electroscope&#8221;\u2014you can tell if an object is charged simply by bringing it near and observing whether the leaves open.<\/p>\n<p>The leaves are held open by electrostatic force, an unstable state that fights against gravity. So what happens when you touch the metal plate with your finger? The human body is also a conductor (a substance that can carry an electric current) and, like the Earth, contains a vast number of free electrons. Since the leaves of the electroscope are positively charged, they attract free electrons from your finger, which flow into the metal plate. This neutralizes the leaves.<\/p>\n<p><a href=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/08c38b3c5ccfb349e6061bcb4b73ba85.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21476 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/08c38b3c5ccfb349e6061bcb4b73ba85.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2015-04-13 23.59.40\" width=\"137\" height=\"207\" \/><\/a><\/p>\n<p>Consequently, the leaves lose their repulsive force and close due to gravity. This phenomenon is called &#8220;grounding&#8221;. The electron distribution for diagram \u2462 looks like this:<\/p>\n<p><a href=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/afec7e7f2d858751541437d8f4c36984.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21477 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/afec4e7f2d858751541437d8f4c36984.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2015-04-14 0.00.00\" width=\"133\" height=\"200\" \/><\/a><\/p>\n<p>Next, when you remove your finger in step \u2463, nothing happens because the electroscope is already electrically neutral. The leaves remain closed. The answer for diagram \u2463 is as follows:<\/p>\n<p><a href=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/2af4ac5914171f9703a8025d7cadc5ce.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21478 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/2af4ac5914171f9703a8025d7cadc5ce.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2015-04-14 0.00.25\" width=\"149\" height=\"223\" \/><\/a><\/p>\n<p>Finally, what happens when you move the charged rod away in step \u2464? The electrons that were gathered at the top of the metal plate by the positive charge of the rod are now released. With nowhere else to go, they scatter throughout the entire electroscope.<\/p>\n<p><a href=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/9c8c2254af79a9ab53648b338dc49093.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21479 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/9c8c2254af79a9ab53648b338dc49093.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2015-04-14 0.00.49\" width=\"202\" height=\"245\" \/><\/a><\/p>\n<p>As a result, the leaves become negatively charged and repel each other, opening up again. The electron distribution for diagram \u2464 is as follows:<\/p>\n<p><a href=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/c184ae3f9083ef7b689e57c4201fa70e.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21480 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/c184ae3f9083ef7b689e57c4201fa70e.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2015-04-14 0.01.08\" width=\"180\" height=\"232\" \/><\/a><\/p>\n<p>Even though static electricity is invisible, it&#8217;s crucial to observe the phenomena by logically considering the movement of free electrons. Every physical phenomenon is connected by a cause and effect. I hope this experiment has sparked your curiosity about the fascinating world of physics.<\/p>\n<p>Please also refer to this experiment for more details.<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"0aV4lzovnc\"><p><a href=\"https:\/\/phys-edu.net\/wp\/?p=34711\">\u7b94\u691c\u96fb\u5668\u3067\u4f55\u304c\u8d77\u3053\u3063\u3066\u3044\u308b\u306e\u304b\uff1f\u96fb\u8377\u306e\u52d5\u304d\u3092\u30a2\u30cb\u30e1\u3067\u518d\u73fe\uff01\uff08\u9759\u96fb\u6c17\u306e\u3075\u3057\u304e\u3092\u4f53\u611f\u3059\u308b\u300c\u7b94\u691c\u96fb\u5668\u300d\uff09<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u201c\u7b94\u691c\u96fb\u5668\u3067\u4f55\u304c\u8d77\u3053\u3063\u3066\u3044\u308b\u306e\u304b\uff1f\u96fb\u8377\u306e\u52d5\u304d\u3092\u30a2\u30cb\u30e1\u3067\u518d\u73fe\uff01\uff08\u9759\u96fb\u6c17\u306e\u3075\u3057\u304e\u3092\u4f53\u611f\u3059\u308b\u300c\u7b94\u691c\u96fb\u5668\u300d\uff09\u201d \u2014 \u79d1\u5b66\u306e\u30cd\u30bf\u5e33\" src=\"https:\/\/phys-edu.net\/wp\/?p=34711&amp;embed=true#?secret=qYceBjGL5X#?secret=0aV4lzovnc\" data-secret=\"0aV4lzovnc\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<h3>\uff16\u6708\u306e\u30a4\u30c1\u30aa\u30b7\u5b9f\u9a13\uff01<\/h3>\r\n<p style=\"text-align: center;\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=64043\">\u30ec\u30e2\u30f3\u3084\u30aa\u30ec\u30f3\u30b8\u3067\u98a8\u8239\u3092\u5272\u308d\u3046\uff01\u30a4\u30f3\u30d1\u30af\u30c8\u304c\u629c\u7fa4\u306e\u30ea\u30e2\u30cd\u30f3\u98a8\u8239\u306e\u5b9f\u9a13<\/a><\/p>\r\n<p style=\"text-align: center;\"><img class=\"alignnone  wp-image-64045\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-06-01-4.45.24.jpeg\" alt=\"\" width=\"406\" height=\"349\" \/><\/p>\r\n<h3 style=\"text-align: left;\"><span style=\"font-size: medium;\"><b><strong>\u30c6\u30ec\u30d3\u756a\u7d44\u76e3\u4fee\u30fb\u30a4\u30d9\u30f3\u30c8\u7b49\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/span><\/h3>\r\n<ul>\r\n<li>\uff16\u6708\uff13\u65e5\uff08\u6c34\uff0920:30\u301c\u3000\u300c<a href=\"https:\/\/phys-edu.net\/wp\/?p=63950\"><wbr \/>\u30d0\u30ab\u30ea\u30ba\u30e0\u306e\u3061\u3087\u3063\u3068\u30d0\u30ab\u308a\u30cf\u30ab\u3063\u3066\u307f\u305f\uff01<\/a>\u300d\uff08\u30c6\u30ec\u30d3\u6771\u4eac\uff09\u3092\u79d1\u5b66\u76e3\u4fee\u30fb\u51fa\u6f14\u3057\u307e\u3059\u3002\u30c6\u30fc\u30de\u306f\u300c<wbr \/>\u305d\u3070\u306e\u51fa\u524d\u306f\u4f55\u4eba\u524d\u307e\u3067\u904b\u3079\u308b\u306e\u304b\u3001\u9650\u754c\u3092\u6e2c\u3063\u3066\u307f\u305f\u300d\u3067\u3059\u3002\u3000<\/li>\r\n<li>\uff16\u6708\uff14\u65e5(\u6728)\u30007:00\u301c\u3000\u300c<a href=\"https:\/\/www.ntv.co.jp\/toppa\/\">THE\u7a81\u7834\u30d5\u30a1\u30a4\u30eb<\/a>\u300d\uff08\u65e5\u672c\u30c6\u30ec\u30d3\uff09\u306b\u3064\u3044\u3066\u79d1\u5b66\u76e3\u4fee\u3057\u307e\u3057\u305f\u3002<\/li>\r\n<li>6\u670814\u65e5\uff08\u65e5\uff09\u3000<a href=\"https:\/\/phys-edu.net\/wp\/?p=63530\">\u5343\u8449\u5927\u5b66\u30a4\u30f3\u30b9\u30bf\u30ec\u30fc\u30b7\u30e7\u30f3\u300c\u63a2\u7a76\u300d<\/a>\u306b\u3066\u8b1b\u5e2b\u3092\u52d9\u3081\u307e\u3059<\/li>\r\n<li>6\u670826\u65e5\uff08\u91d1\uff09\u3000<a href=\"https:\/\/phys-edu.net\/wp\/?p=63067\">\u516c\u958b\u7814\u7a76\u4f1a\u300c\u8131\u4f5c\u696d\u5316\uff01\u30c7\u30b8\u30bf\u30eb\u5316\u3068\u6bb5\u968e\u7684\u6307\u5c0e\u3067\u5b9f\u73fe\u3059\u308b \u30aa\u30fc\u30e0\u306e\u6cd5\u5247\u306e\u63a2\u7a76\u300d<\/a><\/li>\r\n<li>\uff16\u670828\u65e5\uff08\u65e5\uff09\u3000<a href=\"https:\/\/www.davincimasters.jp\">\u30c0\u30d3\u30f3\u30c1\u30de\u30b9\u30bf\u30fc\u30ba\uff20\u662d\u548c\u5973\u5b50<\/a><\/li>\r\n<li>7\u670818\u65e5\uff08\u571f\uff09\u3000<a href=\"https:\/\/phys-edu.net\/wp\/?p=60018\">\u6559\u54e1\u5411\u3051\u5b9f\u9a13\u8b1b\u7fd2\u4f1a\u300c\u30ca\u30ea\u30ab\u30ab\u30b5\u30a4\u30a8\u30f3\u30b9\u30a2\u30ab\u30c7\u30df\u30fc\u300d\u306e\u8b1b\u5e2b\u3092\u3057\u307e\u3059<\/a>\u3002\u304a\u4f1a\u3044\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\r\n<\/ul>\r\n<h3><b>\u66f8\u7c4d<strong>\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/h3>\r\n<ul>\r\n<li>\u300e\u5927\u4eba\u306e\u305f\u3081\u306e\u9ad8\u6821\u7269\u7406\u5fa9\u7fd2\u5e33\u300f\uff08\u8b1b\u8ac7\u793e\uff09\u2026\u4e00\u822c\u5411\u3051\u306b\u65e5\u5e38\u306e\u7269\u7406\u306b\u3064\u3044\u3066\u516c\u5f0f\u3092\u5143\u306b\u7d10\u89e3\u304d\u307e\u3057\u305f\u3002<a href=\"https:\/\/phys-edu.net\/wp\/?p=1827\">\u7279\u8a2d\u30b5\u30a4\u30c8<\/a>\u3067\u306f\u5b9f\u9a13\u3092\u591a\u6570\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002<strong>\u203b\u5897\u5237\u304c\u304b\u304b\u308a\uff16\u5237\u3068\u306a\u308a\u307e\u3057\u305f\uff082026\/02\/01\uff09<br \/><img class=\"alignnone wp-image-10940 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0-300x262.jpg\" sizes=\"(max-width: 220px) 100vw, 220px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0-300x262.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0.jpg 311w\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2014-07-05 0.43.51\" width=\"220\" height=\"192\" \/><br \/><\/strong><\/li>\r\n<li>\u300e\u304d\u3081\u308b!\u5171\u901a\u30c6\u30b9\u30c8 \u7269\u7406\u57fa\u790e \u6539\u8a02\u7248\u300f\uff08\u5b66\u7814\uff09\u2026\u3000\u9ad8\u6821\u7269\u7406\u306e\u53c2\u8003\u66f8\u3067\u3059\u3002\u30a4\u30e9\u30b9\u30c8\u3092\u591a\u304f\u3057\u3066\u30a4\u30e1\u30fc\u30b8\u304c\u6301\u3066\u308b\u3088\u3046\u306b\u63cf\u304d\u307e\u3057\u305f\u3002\u6388\u696d\u306b\u3064\u3044\u3066\u3044\u3051\u306a\u3044\u3001\u7269\u7406\u304c\u82e6\u624b\u3001\u305d\u3093\u306a\u751f\u5f92\u306b\u304a\u3059\u3059\u3081\u3067\u3059\u3002<a href=\"https:\/\/phys-edu.net\/wp\/?p=45322\">\u7279\u8a2d\u30b5\u30a4\u30c8<\/a>\u306f\u3053\u3061\u3089\u3002<br \/><img class=\"alignnone wp-image-45718 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c.jpg\" sizes=\"(max-width: 184px) 100vw, 184px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c.jpg 756w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c-300x269.jpg 300w\" alt=\"\" width=\"184\" height=\"165\" \/><\/li>\r\n<\/ul>\r\n<h3><span style=\"text-align: center;\">\u5404\u7a2eSNS\uff08\u66f4\u65b0\u60c5\u5831\u3092\u304a\u5c4a\u3051\uff01\uff09<\/span><\/h3>\r\n<p style=\"text-align: center;\"><a style=\"text-align: center;\" href=\"https:\/\/twitter.com\/kuwako\">X(Twitter)<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.instagram.com\/science_seeds\/\">instagram<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.facebook.com\/kuwakolab\/\">Facebook<\/a>\uff08\u65e5\u672c\u8a9e\uff09<\/p>\r\n<p style=\"text-align: center;\"><a style=\"text-align: center;\" href=\"https:\/\/bsky.app\/profile\/kagakunoneta.bsky.social\">BlueSky<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.threads.net\/@science_seeds?hl=ja\">Threads<\/a>\uff08\u82f1\u8a9e\uff09<\/p>\r\n<h3 style=\"text-align: center;\"><strong>Explore<\/strong><\/h3>\r\n<ul>\r\n<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=30764\">\u697d\u3057\u3044\u5b9f\u9a13<\/a>\u2026\u304a\u5b50\u3055\u3093\u3068\u4e00\u7dd2\u306b\u5922\u4e2d\u306b\u306a\u308c\u308b\u30a4\u30c1\u30aa\u30b7\u306e\u79d1\u5b66\u5b9f\u9a13\u3092\u591a\u6570\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u9ad8\u6821\u7269\u7406\u306e\u7406\u89e3\u3092\u6df1\u3081\u308b\u305f\u3081\u306e\u52d5\u753b\u6559\u6750\u3082\u7528\u610f\u3057\u307e\u3057\u305f\u3002<\/li>\r\n<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=798\">\u7406\u79d1\u306e\u6559\u6750<\/a>\u2026 \u7406\u79d1\u6559\u5e2b\u3092\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\uff01\u6388\u696d\u306e\u8cea\u3092\u9ad8\u3081\u3001\u6e96\u5099\u3092\u52b9\u7387\u5316\u3059\u308b\u305f\u3081\u306e\u9078\u308a\u3059\u3050\u308a\u306e\u6559\u6750\u3092\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\r\n<li><a 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href=\"http:\/\/phys-edu.net\/wp\/?page_id=37\">About<\/a>\u00a0\u2026\u300c\u79d1\u5b66\u306e\u30cd\u30bf\u5e33\u300d\u306e\u30b3\u30f3\u30bb\u30d7\u30c8\u3084\u3001\u904b\u55b6\u8005\u3067\u3042\u308b\u6851\u5b50\u7814\u306e\u30d7\u30ed\u30d5\u30a3\u30fc\u30eb\u30fb\u60f3\u3044\u3092\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/li>\r\n<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">\u304a\u554f\u3044\u5408\u308f\u305b<\/a>\u00a0\u2026\u5b9f\u9a13\u6559\u5ba4\u306e\u3054\u4f9d\u983c\u3001\u57f7\u7b46\u30fb\u8b1b\u6f14\u306e\u76f8\u8ac7\u3001\u79d1\u5b66\u76e3\u4fee\u7b49\u306f\u3053\u3061\u3089\u306e\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u304a\u5bc4\u305b\u304f\u3060\u3055\u3044\u3002<\/li>\r\n<\/ul>\r\n<p>&nbsp;<\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>Hi, I&#8217;m Ken Kuwako, a science trainer. Every day is an experiment! The gold-leaf electroscope experiment [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":21474,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","sns_share_botton_hide":"","vkExUnit_sns_title":"","vkexunit_cta_each_option":"","_lightning_design_setting":{"layout":"default"},"footnotes":"","jetpack_post_was_ever_published":false},"categories":[781],"tags":[],"class_list":["post-51654","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-en"],"jetpack_featured_media_url":"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/04\/8b346b4cebc6a34919686ba2aa5ed05c.png","jetpack-related-posts":[{"id":53713,"url":"https:\/\/phys-edu.net\/wp\/?p=53713&lang=en","url_meta":{"origin":51654,"position":0},"title":"What\u2019s Really Happening Inside a Gold-Leaf Electroscope? Watch Charges Move in This Animated Reveal! (Experience the Wonders of Static Electricity)","author":"\u6851\u5b50 \u7814","date":"2025\u5e7410\u67084\u65e5","format":false,"excerpt":"I'm Ken Kuwako, your Science Trainer. Every day is\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/09\/fa7b885e076c9ccb993af50f0c06fe6b.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/09\/fa7b885e076c9ccb993af50f0c06fe6b.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/09\/fa7b885e076c9ccb993af50f0c06fe6b.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/09\/fa7b885e076c9ccb993af50f0c06fe6b.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":63483,"url":"https:\/\/phys-edu.net\/wp\/?p=63483&lang=en","url_meta":{"origin":51654,"position":1},"title":"Light Made the Electricity Vanish!? Experience Einstein&#8217;s Greatest Discovery with a Gold-Leaf Electroscope","author":"\u6851\u5b50 \u7814","date":"2026\u5e745\u670817\u65e5","format":false,"excerpt":"I\u2019m Ken Kuwako, the Science Trainer. Every day is \u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/05\/b787ecad58b1def51bfc9db92d1be846.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/05\/b787ecad58b1def51bfc9db92d1be846.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/05\/b787ecad58b1def51bfc9db92d1be846.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/05\/b787ecad58b1def51bfc9db92d1be846.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/05\/b787ecad58b1def51bfc9db92d1be846.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":55085,"url":"https:\/\/phys-edu.net\/wp\/?p=55085&lang=en","url_meta":{"origin":51654,"position":2},"title":"Edo Magic: The Static Electricity Secret Behind a Japanese Scientist&#8217;s Self-Ringing Bell","author":"\u6851\u5b50 \u7814","date":"2025\u5e7410\u670828\u65e5","format":false,"excerpt":"I\u2019m Ken Kuwako, Science Trainer. Every day is an e\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/8b90c4e75c86e33b4566acde9655008d.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/8b90c4e75c86e33b4566acde9655008d.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/8b90c4e75c86e33b4566acde9655008d.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/8b90c4e75c86e33b4566acde9655008d.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":55147,"url":"https:\/\/phys-edu.net\/wp\/?p=55147&lang=en","url_meta":{"origin":51654,"position":3},"title":"Why Does the Weight Move? 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Every Day is an \u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/07\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-07-13-5.23.29.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/07\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-07-13-5.23.29.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/07\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-07-13-5.23.29.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/07\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-07-13-5.23.29.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/07\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-07-13-5.23.29.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/07\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-07-13-5.23.29.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":53592,"url":"https:\/\/phys-edu.net\/wp\/?p=53592&lang=en","url_meta":{"origin":51654,"position":4},"title":"Walk Your Soda Can with a Balloon: The Secret of Electrostatic Induction","author":"\u6851\u5b50 \u7814","date":"2025\u5e7410\u67082\u65e5","format":false,"excerpt":"Hi, I'm Ken Kuwako, your Science Trainer! 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