magnets p7

• Flemming’s left-hand rule:

   

  thumb – Movement

  Forefinger – magnetic Field

  seCond finger - Current
• Conventional current: positive to negative

  Electron current: negative to positive 
• A device which produces an electric field when an electrical current is passes through a wire is called an electromagnet.

  The shape of the magnetic field depends on the shape of the wire.
• A solenoid consists of a wire coiled up into a spiral shape.

  When an electric current flows, the shape of the magnetic field is very similar to the field of a bar magnet
• A permanent magnet is an object that always has a magnetic field.

  The space around a magnet, where it can attract magnetic materials, is called the magnetic field. When a piece of magnetic material is in a magnetic field, it becomes a magnet itself. This is called an induced magnet. It stops being magnetic when it is removed from the field.
• Like poles repel, opposite poles attract.