magnetic field between bar magnets

background concept element experiences design current magnetic attraction force field electromagnetism neutral line negative charged region dipole like forces opposing north seeking red black poles metal positive ferromagnetic opposites field south symbol education simple experiment action potential energy law shape like magnets pole two repelling face business charge direction flux force atoms rule piece repulsion diagram magnet vector physics two magnetism north attract south science magnetic bar arrow iron blue red bar lines electricity electric electromagnet magnet repel polarity