What is the relationship between current flow and magnetic fields?
This is the Right Hand Rule for magnetic field from flowing current, and for magnetic field in a coil. When current flows in a wire, a magnetic field is created around the wire. To visualize this, take your right hand, curl the fingers, and stick the thumb straight out. Now, point your thumb in the direction of the current flowing in the wire (using conventional current where current flows from the + end of a battery to the – end of the battery. NOTE: electrons flow from the – end of a battery to the + end, and is called electron current instead of conventional current). The direction your fingers are curved around the wire is the direction of the magnetic field around the wire. For example, if the current were coming straight out of this page toward you, your thumb would be pointing toward you and your fingers would indicate a counter-clockwise direction to the magnetic field around the wire. This shows the magnetic field around a wire carrying current. This shows the strength of the
