Exam 6: Magnets and Magnetism

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

All artificial magnets are permanent magnets.

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

A(n) ____ produces a magnetic field.

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

According to the electron theory of magnetism, electrons produce a magnetic field as they spin.

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

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

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

Air is the best conductor of magnetism.

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

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

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

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

The three classes of magnets are natural, artificial, and electromagnets.