Magnetism and Electromagnetism Quiz

Study Notes

Magnetism is attributed to ferromagnetism and electromagnetism.
Every atom has a magnetic field due to electron spins and domains.
Unmagnetized materials have magnetic domains in random directions.
When a material is magnetized, the magnetic domains align in the same direction.
Magnets have two poles: north and south.
Attraction: North-South, South-North
Repulsion: North-North, South-South
If an object attracts to a magnet, it contains ferromagnetic material.
If an object can attract and repel a magnet, it is a permanent magnet, or is a temporarily magnetized ferromagnetic material.

In 1819, Hans Christian Oersted discovered that a compass needle deflected when a current was switched on.
This discovery led to research on electromagnetism.
Michael Faraday conducted the induction ring experiment, proving that current can be produced by changing magnetic fields.
Electromagnetic induction is the phenomenon of inducing voltage in a conductor by changing the magnetic field near the conductor.

Magnetic induction is the process of magnetizing a ferromagnetic substance by placing it near a magnet.
This process causes the magnetic domains in the substance to align with the magnet's field.

The process of magnetic induction causes a screw to behave like a magnet when it is placed close to a magnet.

Electric fields are present around charges in motion, such as a spark jumping between two rods.
Magnetic fields are produced by moving charges, such as a welder's arc flash.
An improvised compass can determine the polarity of an unmarked magnet.
The magnetic field around a straight current-carrying wire is strongest near the wire and consists of circular lines around the wire.