2021年08月03日

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20.07579080936JSite->dispatch( ).../index.php:42
30.07619098536JComponentHelper::renderComponent( ).../application.php:194
40.07789142520JComponentHelper::executeComponent( ).../helper.php:348
50.07799163320require_once( '/home/users/1/jein/web/jein/components/com_content/content.php' ).../helper.php:380
60.07979436816JController->execute( ).../content.php:16
70.07979437200ContentController->display( ).../controller.php:761
80.08289987088JController->display( ).../controller.php:74
90.085910559864ContentViewArticle->display( ).../controller.php:722
100.100911790336JDispatcher->trigger( ).../view.html.php:121
110.101011792144JEvent->update( ).../dispatcher.php:161
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130.101011793152plgContentJw_allvideos->onContentPrepare( ).../event.php:71
140.101011795800plgContentJw_allvideos->renderAllVideos( ).../jw_allvideos.php:41

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Call Stack
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10.0002231000{main}( ).../index.php:0
20.07579080936JSite->dispatch( ).../index.php:42
30.07619098536JComponentHelper::renderComponent( ).../application.php:194
40.07789142520JComponentHelper::executeComponent( ).../helper.php:348
50.07799163320require_once( '/home/users/1/jein/web/jein/components/com_content/content.php' ).../helper.php:380
60.07979436816JController->execute( ).../content.php:16
70.07979437200ContentController->display( ).../controller.php:761
80.08289987088JController->display( ).../controller.php:74
90.085910559864ContentViewArticle->display( ).../controller.php:722
100.100911790336JDispatcher->trigger( ).../view.html.php:121
110.101011792144JEvent->update( ).../dispatcher.php:161
120.101011793072call_user_func_array:{/home/users/1/jein/web/jein/libraries/joomla/event/event.php:71} ( ).../event.php:71
130.101011793152plgContentJw_allvideos->onContentPrepare( ).../event.php:71
140.101011795800plgContentJw_allvideos->renderAllVideos( ).../jw_allvideos.php:41

バラバラ磁石と揃った磁石(EM-M-07)

<バラバラ磁石と揃った磁石>

 

磁石は2つに切ってもまた2つに切ってもまた磁石になっていることをゴム磁石で確かめましたね。
そこで磁石を砕いて豆磁石の塊にして、中の豆磁石の向きがそろっている状態にしてみたり、バラバラにしてみたりして、磁石の構造を調べてみたいと思います。
この実験から、磁石になった釘は、叩いたり、火にかけたりすると磁力がなくなっていくことも分かりますね。