Magnetism and the motor effect GapFill

A magnetic field flows from a north pole to a south pole. A magnetic field line shows the direction in which  a south polea north polean electrona magnetic material would feel a force. Only some materials are attracted to a magnet, such as  iron and nickelhydrogen and heliumcopper and aluminiumgold and silver.
Some magnets produce their own magnetic field all the time; these are known as  solenoidpermanentinducedmotor magnets. Others only become magnetic when placed in a magnetic field; these are known as  inducedsolenoidmotorpermanent magnets.
A wire carrying a current produces a magnetic field; the magnetic field lines  move in circles around the wire, along its entire lengthpoint directly out of the wireflow from one end of the wire to the othermove in circles around the wire at certain points.  A permanent magnetA solenoidAn electromagnetA transformer is a current-carrying wire wrapped into a long coil, so that the magnetic field lines are in the same shape as those for a bar magnet;  adding an iron core in the middleadding another coilincreasing the currentcoating the wire in plastic turns this into an electromagnet and increases the strength of the magnetic field produced.
A wire carrying a current will experience a force in a magnetic field, known as the motor effect. The direction of this force can be found using  Tesla's left-hand ruleFleming's left-hand ruleFleming's right-hand ruleTesla's right-hand rule, which uses the direction in which the thumb, first finger and second finger point to represent a variable:  thumb = force; first finger = magnetic field; second finger = currentthumb = force; first finger = current; second finger = magnetic fieldthumb = current; first finger = force; second finger = magnetic fieldthumb = current; first finger = magnetic field; second finger = force. The strength of this force can be found using the equation  F = BILF = I/BLF = BI/LF = B/IL, where F is force, measured in newtons, I is current, measured in amperes, L is length, measured in metres, and B is magnetic field strength, measured in  teslaswebersedisonsflemings.