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  both polesa south polea north polea proton would feel a force. Only some materials are attracted to a magnet, such as  gold and silveriron and nickelcarbon and oxygenmagnesium and manganese.
Some magnets produce their own magnetic field all the time; these are known as  inducedbarhorseshoepermanent magnets. Others only become magnetic when placed in a magnetic field; these are known as  permanentinducedhorseshoebar magnets.
A wire carrying a current produces a magnetic field; the magnetic field lines  move in circles around the wire, along its entire lengthflow from one end of the wire to the otherrun parallel along the length of the wirepoint directly into the wire.  A permanent magnetA solenoidAn induced magnetAn electromagnet 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;  increasing the number of coilsreversing the direction of the currentadding an iron core in the middlecoating 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  Fleming's left-hand ruleFleming's right-hand ruleEdison's left-hand ruleEdison'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 = magnetic field; first finger = current; second finger = forcethumb = magnetic field; first finger = force; second finger = current. The strength of this force can be found using the equation   F = L/BIF = BILF = I/BLF = IL/B, 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  flemingsteslaslenzesfaradays.