Magnetism

• At which part of a magnet is it strongest?

  The poles.
• What happens when two magnets are brought close together?

  They exert a force on eachother.
• What is a magnetic field?

  The region surrounding a magnet where another magnet or magnetic material experiences a non-contact force.
• What is a permanent magnet?

  Produces its own magnetic field.
• What is an induced magnet?

  Only magnetic when in a magnetic field.
• Induced magnetism always causes what type of force?


  A force of attraction.
• Give four magnet materials.

  Iron, steel, cobalt, nickel
• In what direction does a magnetic field point?

  In the direction of the force that a North Pole would experience if places in the field, from the north seeking pole to the south seeking pole of a magnet.
• What does a magnetic compass contain?

  A small bar magnet that points in the direction of the Earth’s magnetic field.
• What is produced when current flows through a conducting wire?

  A magnetic field around it.
• What determines the strength of the magnetic field around a current-carrying wire?

  The magnitude of the current flowing through the wire.
• What does a high concentration of field lines indicate?

  A strong magnetic field.
• How is a plotting compass used to map out a magnetic field?

  By aligning the compass needle with the magnetic field lines and marking the direction of the needle at different points, a map of the magnetic field can be created.
• What is a solenoid?

  A coil of wire which, when current passes through it, creates a strong magnetic field.
• Describe the magnetic field inside a solenoid.

  Strong and uniform.
• What is the field outside a solenoid like?

  Weak, the fields from each coil cancel out.