electromagnets

• a solenoid is 2 coils of wire wrapped around a core of iron
• a solenoid and a bar magnet both have magnetic fields
• iron,steel and nickel are 3 metals that are magnetic and are found in the earths crust
• bar magnets have 2 poles (north and south)
• a magnet can be non contact if it is not touching the material it is attracted to
• a magnet can be contact if it is made of iron or steel, or it can be a permanent magnet
• a non permanent magnet is a magnet that is 100% magnetic when it is in its original shape but loses its magnetism when it is bent or broken
• a solenoid is an electromagnet
• a bar magnet is a permanent magnet
• a solenoids control can be turnt off/on
• a bar magnets control is permanent
• What is an alloy?


  An alloy is a mixture of two or more elements where one is a metal.
• How is an electromagnet formed?


  An electromagnet is formed by a current passing through a wire.