Topic 12

• A solenoid with an iron core.

  Electromagnet
• When a current-carrying wire is placed perpendicular to a magnetic field, a force is exerted on it. The force is proportional to the magnetic field to the magnetic flux density of the field and proportional to the current and length of the wire.

  Force on a Wire
• A rule used to determine the orientation of the force/current/magnetic field when a current-carrying wire is placed in a magnetic field (motor effect).

  Fleming’s Left-Hand Rule
• A material that becomes a magnet when it is placed in an existing magnetic field, but loses its magnetism quickly once it is removed, it always produces an attractive force.

  Induced Magnet
• A current-carrying could of wire in a magnetic field. The two sides of the coil that are perpendicular to the magnetic field experience forces in opposite directions, causing rotation.


  Electric Motor
• When current flows through a wire, a magnetic field is generated around it. The strength of the field depends on the magnitude of the current and the distance from the wire.

  Current-Carrying Wires
• When matching poles of a magnet are brought near each other they repel each other.

  Like Magnetic Poles
• Iron, steel, cobalt and nickel.

  Magnetic Materials
• The regions of a magnet where the magnetic forces are at their strongest.

  Magnetic Poles
• A magnet that produces its own magnetic field.

  Permanent Magnet
• A wire wrapped into the shape of a coil, that has a strong and uniform magnetic field inside of it. The solenoid’s magnetic field strength can be increased by adding an iron core.

  Solenoid
• The unit of magnetic flux density.

  Tesla
• When opposite poles of a magnet are brought near each other they attract each other.

  Unlike Magnetic Poles