Magnetism + electromagnetism

• What is a magnet?

  A material that produces a magnetic field
• What does a magnet produce?

  A magnetic field
• Three examples of magnets

  A bar magnet

  A horseshoe magnet

  the earth
• The arrows on a magnetic field always point:

  Out from the north and in to the south
• How do we represent magnetic fields?

  Using field lines
• What is a magnet?

  A material that produces a magnetic field
• What is the most common type of magnet?

  Bar magnet
• What do all magnets have in common?

  They have a north and a south pole
• What do magnetic field lines represent?

  The direction and strength of the magnetic field
• How do you draw field lines for a magnet?

  From the north pole to the south pole
• What is the significance of the density of field lines?

  It indicates the strength of the magnetic field
• Where is the magnetic field strongest?

  Near the north pole
• How can we find the poles of a magnet?

  Using a compass
• Why does a compass needle point towards the south pole of a magnet?

  Because it is a tiny bar magnet itself
• What happens when you push the north poles of two magnets together?

  They repel each other
• What occurs when opposite poles of magnets are brought together?

  They attract each other
• What are the steps to draw magnetic field lines?

  • Draw a straight line into the south pole
  • Draw a line coming out of the north pole
  • Add a pair of slightly curved lines into the south pole
  • Add a similar pair coming out of the north pole
  • Draw loops from north to south
  • Ensure arrows point out of north and into south
• What is the interaction between two like poles of magnets?

  • They repel each other
  • Field lines between them show repulsion
  • Makes it hard to squeeze them together
• What is the interaction between two opposite poles of magnets?

  • They attract each other
  • Field lines go from north to south
  • Creates a pulling force between them
• What is a magnetic material?

  Any object influenced by a magnetic field
• What is an actual magnet?

  Any object that produces a magnetic field
• What is the difference between magnetic materials and actual magnets?

  Magnetic materials can be influenced, magnets produce fields
• Which element is a common magnetic material?

  Nickel
• Why is only some nickel a magnet?

  Not all nickel pieces are magnets
• What are the other common magnetic elements?

  Cobalt and iron
• What do the first letters of nickel, cobalt, iron, and steel spell?

  NCIS
• What type of magnets produce their own magnetic field all the time?

  Permanent magnets
• What are induced or temporary magnets?

  Magnets that have a magnetic field temporarily
• How is an induced magnet created?

  By placing a magnetic material in a magnetic field
• What happens to a piece of nickel when placed in a permanent magnet's field?

  It develops its own magnetic field
• What is the nature of the force between permanent and induced magnets?

  It is always attractive
• What happens to an induced magnet when removed from a magnetic field?

  It loses its magnetism
• What are magnetically soft materials?

  Materials that lose magnetism quickly
• What are magnetically hard materials?

  Materials that lose magnetism slowly
• What are the key differences between permanent magnets and induced magnets?

  • Permanent magnets produce their own magnetic field continuously.
  • Induced magnets only have a magnetic field temporarily.
  • Induced magnets require a permanent magnet's field to develop magnetism.
• What are the characteristics of magnetically soft and hard materials?

  • Magnetically soft materials:
  • Lose magnetism quickly
  • Magnetically hard materials:
  • Lose magnetism slowly