میدان مغناطیسی: تفاوت میان نسخه‌ها

* {{cite book | author=Furlani, Edward P. | title=Permanent Magnet and Electromechanical Devices: Materials, Analysis and Applications | publisher= Academic Press Series in Electromagnetism | year=2001 | isbn=0-12-269951-3 | oclc=۱۶۲۱۲۹۴۳۰162129430}}