Electric Fields (03:27)
The evolution of electric field theory is examined. Methods developed for indicating the strength of an electric field around a charged object, and the direction in which the field acts, are described.
Properties of magnets are examined. The attractive and repulsive forces of magnetized objects are explored.
Magnetic Fields (02:01)
It is an accepted theory that magnetized objects are surrounded by fields of magnetic force. Properties and behavior of magnetic fields are examined.
In 1819 Danish physicist Hans Christian Oersted discovered a relationship between electricity and magnetism. Today, electromagnetism is the basis for devices such as electric motors and electric generators.
The Left (or Right) Hand Rule (03:01)
When electric current flows in a wire there is a region of magnetic force which encircles the wire. The Right-Hand Rule and the Left-Hand Rule describe the direction of this magnetic force.
Electric Coils (02:46)
The potential for a magnetic field surrounding a current-carrying wire to do useful work increases greatly when that wire is bent into a simple coil. Properties and applications of magnetic coils are explored.
A solenoid is a tightly-wound helix of current-carrying wire. Properties of solenoids, and their similarities to bar magnets, are examined.
Solenoid Switches (01:28)
One important use of a solenoid is as a mechanical switch which is turned on and off by electricity. The construction, function, and application of solenoids are explored.
Electromagnets are used in many practical everyday applications. The scientific principles which underlie the construction and function of electromagnets are explored.
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