magnetism

• What are the ends of a magnet called?

  Poles
• How many poles do magnets have?

  Two
• What happens when two magnets are held close together?

  They exert attractive or repulsive forces
• What do opposite poles of magnets do?

  They attract each other
• What do like poles of magnets do?

  They repel each other
• What materials are attracted to magnets?

  Magnetic materials
• Which metals are considered magnetic?

  Iron, cobalt, nickel
• Why is steel considered magnetic?

  It contains iron
• How can you test if a material is a magnet?

  Bring it close to a known magnet
• What indicates that a material is a magnet when tested?

  If it can be repelled by a magnet
• What happens to a magnetic material when placed in a magnetic field?

  It can become an induced magnet
• What are permanent magnets made from?

  Permanent magnetic materials
• What is induced magnetism?

  Temporary magnetism in a magnetic field
• What happens to a magnetic material when removed from a magnetic field?

  It loses most/all of its magnetism
• What is the strongest part of a magnet?

  The poles
• How is a magnetic field defined?

  Region where a force acts on magnets
• What do magnetic field lines represent?

  Strength and direction of a magnetic field
• What indicates a strong magnetic field in field lines?

  Close spacing of the lines
• What indicates a weak magnetic field in field lines?

  Far spacing of the lines
• In which direction do magnetic field lines go?

  From north to south
• What is a uniform magnetic field?

  Same strength and direction at all points
• How is a uniform magnetic field created?

  By holding opposite poles close together
• What happens to magnetic field lines in a uniform field?

  They are equally spaced
• Where is the magnetic field strongest around a bar magnet?

  At the poles
• How does the magnetic field change with distance from a magnet?

  It becomes weaker as distance increases
• What do the field lines look like for attracting bar magnets?

  They curve towards each other
• What do the field lines look like for repelling bar magnets?

  They curve away from each other
• What is the purpose of a plotting compass?

  To investigate magnetic field shape and direction
• How do you use a plotting compass to map a magnetic field?

  Draw dots along the compass direction
• What does the arrow of a plotting compass represent?

  The north pole of the compass
• What does the Earth's magnetic field resemble?

  That of a bar magnet
• Why does a compass point north?

  Earth's core is magnetic
• What is the geographic North Pole in terms of magnetism?

  A magnetic south pole
• Why is the north pole of a compass attracted to the Earth's magnetic North Pole?

  Because it is a magnetic south pole
• What is the geographic South Pole in terms of magnetism?

  A magnetic north pole
• Why is the north pole of a compass repelled from the Earth's magnetic North Pole?

  Because it is a magnetic north pole
• How does the Earth's north pole behave like a magnet?

  It acts like a magnetic south pole