Electromagnetism Test 1

What is a magnet?

• A device that attracts iron, nickel, or cobalt and produces a magnetic field

• A device that repels iron, nickel, or cobalt

• A device that attracts only plastic

• A device that produces an electric field

Fill in the blank: The term _______ refers to the physical properties and interactions of magnets.

• magnetism

• electricity

• gravity

• friction

A _______ is a force field present around a magnet which exerts a force (a push or a pull) on other magnets or magnetic materials.

• magnetic field

• electric field

• gravitational field

• nuclear field

Fill in the blank: A magnetic pole is the north (+) or south (-) end of a magnet where the force is the _______.

• greatest

• weakest

• neutral

• least

What happens when opposite poles of two different magnets are brought close to each other?

• A) They repel each other.

• B) They attract each other.

• C) They have no effect on each other.

Fill in the blank: When the same poles of two magnets are brought close to each other, they ______.

• repel each other.

• attract each other.

• do nothing.

• stick together.

How can atoms be made to align to create temporary magnets?

• A) By heating the material

• B) By passing an electric current through the material

• C) By placing the material next to a magnet

• D) Both B and C.

What is a permanent magnet?

• A) A material that loses its magnetic properties after being removed from a magnetic field.

• B) A material that maintains its magnetic properties even after being removed from a magnetic field.

• C) A material that can only be magnetized temporarily.

• D) A material that cannot be magnetized.

The strength of a magnet is determined by its:

• Size

• Material

• Shape

• Temperature

Fill in the blank: An electromagnet is a temporary magnet created by coiling a wire around a metal core, and passing a ______ through the wire.

• current

• voltage

• light

• sound