magnetism + electromagnetism

• what are the parts of a magnetic where the magnetic forces are strongest?

  poles
• what do two like poles of a magnet do?

  repel
• what do two unlike poles of a magnet do?

  attract
• what type of force is the attraction and repulsion of non-contact forces?

  non-contact
• what type of magnet produces its own magnetic field?

  permanent magnet
• what type of magnet is a material that becomes a magnet when placed in a magnetic field?

  induced magnet
• what force does an induced magnet always cause?

  a force of attraction
• what happens when an induced magnet is removed from a magnetic field?

  loses most or all of its magnetism
• what is the region around a magnet where a force acts on another magnet?

  magnetic fields
• what are magnetic materials?

  iron, steel, cobalt, nickel
• what does strength of a magnetic field depend upon?

  distance from the magnet
• in what direction does a magnetic field line act?

  from north to south pole of the magnet
• what does a magnetic compass contain?

  a small bar magnet
• where does a compass needle point?

  in direction of earths magnetic field
• when a current flows through a conducting wire what is produced around the wire?

  magnetic field
• what does strength of a magnetic field around a wire depend on?

  distance from wire + current through wire
• what can you shape a wire into to increase strength of magnetic field?

  a solenoid
• how can you describe the magnetic field inside a solenoid?

  strong and uniform
• what can be added to increase strength of the magnetic field of a solenoid?

  an iron core
• what is a solenoid with an iron core called?

  electromagnet
• what is the magnetic field around a solenoid shape similar to?

  magnetic field around a bar magnet
• when a conductor carrying a current is placed in a magnetic field the magnet producing the field and conductor exert a force on eachother what is this called?

  the motor effect
• what rule shows orientation of the forces and fields in a motor?

  flemings left hand rule
• what does the first finger represent in flemings left hand rule?

  direction of magnetic field
• what does the middle finger represent in flemings left hand rule?

  direction of current
• what does thumb represent in flemings left hand rule?

  direction of force
• what is standard unit for magnetic flux density?

  Tesla
• what does a coil of current carrying wire in a magnetic field tend to do?

  rotate
• what does a coil of current carrying wire in a magnetic field make?


  an electric motor
• what type of movement does an electric motor produce?

  rotation