Exam 6: Magnets and Magnetism

Air is the best conductor of magnetism.

The unit of measurement of flux in a magnetic circuit is called the ____.

The two main theories of magnetism are the molecular and electron theories.

All artificial magnets are permanent magnets.

Because all materials have some ability to conduct magnetic lines of force, it is not practical to make a magnetic insulator.

Which term describes magnetism that remains in a material after being removed from the magnetizing influence?

Which term describes the ability of a material to retain its magnetism after being removed from the magnetizing influence?

Using the left-hand rule for a single conductor, with your left hand around the conductor with thumb extended in the direction of current flow, the fingers will point in the direction of the ____.

If two conductors carrying current in the same direction are placed near each other, the magnetic forces tend to ____.

Which term describes the ability of a material to conduct lines of force?

A(n) ____ is also known as an electromagnet.

A(n) ____ produces a magnetic field.

There are three classes of magnets: natural, artificial and electromagnets.

One of the most common types of permanent magnets is made of ____.

Which material is often used to protect sensitive instruments from electromagnetic fields?