2.  Electric generators  Television sets  Cathode-ray displays  Computer hard drives  Compass

3.  Polarized-magnets are polarized. They have two distinct and opposite ends.  North pole and South pole  Like electric charges, likes repel and opposites attract  However, charges can be separated magnetic poles cannot.

4.  The Earth itself is a large magnet.  The north end of a compass needle (a magnet) points to the geographic north pole.  The geographic north pole is the magnetic south pole

6.  A magnet can cause another metal to become polarized and have magnet properties.

7.  Because of the microscopic nature of the material it keeps the magnetic properties  ALNICO V-a permanent magnet alloy aluminum, nickel, and cobalt  Rare earth elements neodymium and gadolinium produce very strong permanent magnets for their size

8.  Magnetic forces can be describe by the existence of a field around the magnet  Much like gravitational and electric fields  Can be non-contact forces  Magnetic fields are vector quantities that exist in a region in space where a magnetic force occurs.

10.  Magnetic field lines are imaginary lines used to help visualize a magnetic field.  Direction of field lines are defined as the direction that a compass points when placed in the magnetic field.  Outside the magnet field lines leave the magnet from the north pole and end the south  Inside the magnet from south to north to form a closed loop.

11.  The number of field lines passing through a surface is the magnetic flux  The flux per unit area is proportional to the strength of the magnetic field.

12.  In 1820, Danish physicist Hans Christian Oersted experimented with electric currents in wires.  Found that when a current was in a wire a compass needle rotated until it was perpendicular to the wire.  If the compass needle rotated it must have been because of a magnetic field.

13.  Circular line indicate that magnetic field lines around a current carrying wire for closed loop in the same way that field lines about a permanent magnet for closed loops.

15.  A method to determine the direction of a magnetic field relative to the direction of conventional current  Pretend to hold the wire with your right hand  Point you thumb in the direction of conventional current  Your fingers point in the direction of the magnetic field.

17.  A long coil of wire consisting of many loops is called a solenoid.  The field of each loop adds to the fields of the other loops and creates a greater total field strength.

19.  A method used to determine the direction of the field produced by an electromagnet relative to the flow of conventional current.  Curl your right hand fingers around the loops in the direction of the conventional current  Your thumb points toward the north pole of the electromagnet

21.  Electrons in an atom acts like a tiny electromagnet  Domain is when the magnetic fields of the electrons in a group of neighboring atoms are all aligned in the same direction  When a piece of iron is not in a magnetic field the domains point in random directions and their magnetic fields cancel each other out.

22.  In the case of a temporary magnetic and external magnetic field aligns the domains and when the external magnetic field is removed the domains return to their random arrangement  In a permanent magnet the iron keeps the domains aligned after the external magnet is removed.