الفلزات توصل التيار الكهربائي في حالتها الصلبة بسبب وجود بحر الإلكترونات حرة الحركة

ما الاداة التي تنتج تياراَ كهربائياَ من خلال دوران ملف فلزي بين قطبي مغناطيس

Fatal error: Uncaught ErrorException: md5_file(/home/jnyhnews/public_html/wp-content/litespeed/css/e3fcbdd8c282ad1471bbf18a77067f4c.css.tmp): failed to open stream: No such file or directory in /home/jnyhnews/public_html/wp-content/plugins/litespeed-cache/src/optimizer.cls.php:140 Stack trace: #0 [internal function]: litespeed_exception_handler() #1 /home/jnyhnews/public_html/wp-content/plugins/litespeed-cache/src/optimizer.cls.php(140): md5_file() #2 /home/jnyhnews/public_html/wp-content/plugins/litespeed-cache/src/optimize.cls.php(837): LiteSpeed\Optimizer->serve() #3 /home/jnyhnews/public_html/wp-content/plugins/litespeed-cache/src/optimize.cls.php(330): LiteSpeed\Optimize->_build_hash_url() #4 /home/jnyhnews/public_html/wp-content/plugins/litespeed-cache/src/optimize.cls.php(264): LiteSpeed\Optimize->_optimize() #5 /home/jnyhnews/public_html/wp-includes/class-wp-hook.php(324): LiteSpeed\Optimize->finalize() #6 /home/jnyhnews/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters() #7 /home/jnyhnews/public_htm in /home/jnyhnews/public_html/wp-content/plugins/litespeed-cache/src/optimizer.cls.php on line 140