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Compass
A device used to show magnetic field direction. It consists of a small magnet pivoted so that it is free to move in a horizontal plane. In the earth’s magnetic field a compass points along the magnetic meridian. A scale, graduated in degrees, may be placed underneath the magnet to assist in navigation.
Electric Motor
These motors operate on a basic principle known as Ampere’s Law. This law states that a wire carrying an electrical current produces a magnetic field around itself. The presence of that current creates a magnetic field around the wire. Since the loop itself has become a magnet, one side of it will be attracted to the north (N) pole of the surrounding magnet and the other side will be attracted of the south (S) pole of the magnet.
Microphone
The diaphragm by its motion causes a corresponding change in some property of an electric circuit. Depending on the type of microphone, displacement of the diaphragm may cause variations in the resistance of a carbon contact (carbon microphone), in electrostatic capacitance (condenser microphone), in the motion of a coil (dynamic microphone) or conductor (ribbon microphone) in a magnetic field, or in the twisting or bending of a piezoelectric crystal (crystal microphone). In each case, motion of the diaphragm produces a variation in the electric output.
MRI Machine
VHS Tape
The recording media is a 12.7 mm wide magnetic tape wound between two spools, allowing it to be slowly passed over the various playback and recording heads of the video cassette recorder.
Speakers
When the electrical current flowing through the voice coil changes direction, the coil's polar orientation reverses. The voice coil is a basic electromagnet it constantly reverses the flow of electricity.
Credit cards
The stripe on the back of a credit card is a magnetic stripe, often called a magstripe. The magstripe is made up of tiny iron-based magnetic particles in a plastic-like film. Each particle is really a tiny bar magnet about 20-millionths of an inch long.
Cell Phone Chargers
Most transformers are the old style, which are essentially a short circuit over a coil to make a magnetic field and convert the power down to a usable voltage. When nothing is connected these transformers just choke on their own eddy currents in the transformer...and burn power.
Magna doodle
he Magna Doodle is basically a magnetic drawing board. It has the following pieces: White plastic display screen (magnetophoretic display) - what you write on Pen or stylus with a magnet at the tip - what you write with String attached to the pen - holds the pen to the Magna Doodle Long, thin, sliding magnet behind the screen - what you erase with