magnetism and electromagnetism

• a bar magnet has 2 ends
• the ends on a bar magnet are called poles
• what are the 2 ends on a bar magnet called

  north and south pole / poles
• the magnetic forces are strongest at the poles of a magnet
• where are the magnetic forces strongest

  poles of the magnet
• when two magnets are close together they exert a force on each other
• what do 2 magnets do when they are close together

  exert a force on each other
• like poles repel
• what do like poles do

  repel
• unlike poles attract
• what do unlike poles do

  attract
• the attraction and repulsion between magnetic poles are examples of non-contact forces
• the attraction and repulsion of magnetic poles are examples of what

  non-contact forces
• a permanent magnet produces its own magnetic field
• does a permanent magnet produce its own magnetic field

  yes
• permanent magnets can attract or repel each other
• what is an induced magnet

  an object that becomes a magnet when it is placed in a magnetic field
• an induced magnet is an object that becomes magnetic when its placed in a magnetic field
• Induced magnetism ALWAYS causes a force of attraction
• do induced magnets cause a force of attraction

  yes they always cause a force of attraction
• what are the two types of magnet

  permanent or induced
• a permanent magnet always has a magnetic field
• there are 4 types of magnetic material
• what are the 4 types of magnetic material

  iron , steel , cobalt , nickel
• what is a magnetic field

  a region around a magnet where a force acts on another magnet or on a magnetic material
• a magnetic field is the area surrounding a magnet where another magnet or magnetic material would experience a force
• the strength of a magnetic field depends on distance from the magnet
• what can you use to plot magnetic field lines

  a magnetic compass
• in what direction do magnetic field lines go

  from north poke to south pole
• magnetic field lines go from north pole to south pole
• how can we show the earths magnetic field

  a magnetic compasses needle ( when undisturbed )points in the north to south direction
• what causes the earths magnetic field

  the earths core
• permanent magnets can not repel induced magnets
• The force between a magnet and magnetic material is always one of attraction
• when a current flows through a conducting wire a magnetic field is produced around the wire
• what happens when a currents flows through a wire

  a magnetic field is produced around the wire
• a larger current produces a stronger magnetic field
• when is the magnetic field strongest ( wire )


  when its closest to the wire
• if the direction of current changes then so does the direction of the magnetic field
• what can you use to work out the direction of a current around a wire

  right hand grip rule