Правило десне руке — разлика између измена

* {{Cite book |ref= harv|last = Fleming | first = John Ambrose | authorlink = | coauthors = | title = Magnets and Electric Currents, 2nd Edition | publisher = E.& F. N. Spon | year = 1902 | location = London | pages = 173–174 | url = http://books.google.com/books?id=ASUYAAAAYAAJ&pg=PA173 | doi = | id = | isbn = |ref=harv}}