Unit 10 A Test

Placing the north pole of a magnet near the south pole of another magnet results in:

• an attractive force between the magnets.

• a repulsive force between the magnets.

• an electric force between the magnets.

• no force between the magnets

A student places two magnets with their north and south poles facing each other. What will happen as she changes the distance?

• As the distance gets larger, the magnets will start to attract.

• As the distance gets smaller, the magnets will start to attract.

• As the distance gets larger, the magnets will start to repel.

• As the distance gets smaller, the magnets will start to repel.

If a bar magnet is cut into two pieces:

• you get 2 smaller magnets, each with a north and south pole.

• you get 2 smaller magnets, on that’s just a north and one that’s just a south.

• you can’t cut a bar magnet in half

• you get 2 smaller magnets, one with two north poles, one with two south poles.

Which pair of objects in the image experiences a repulsive force?

• A & B

• A & C

• B & D

• B & C

Which pair of objects in the image experiences a attractive force?

• A & B

• A & C

• B & D

• B & C

In which area of the image is the magnetic field strongest?

• A

• B

• C

• D

In the image, which direction should the magnetic field lines be pointing?

• From South to North

• From North to South

• From East to West

• From West to East

The most common way to make an electromagnet is to wrap a coil of wire around a:

• vacuum.

• wooden rod.

• glass rod.

• iron rod.

The source of a material’s magnetism is the:

• charge of its protons.

• mass of its neutrons.

• atoms being lined up.

• density of its nucleus.

If you reverse the direction of current flow in an electromagnet:

• the magnetic field will reverse.

• the magnet is neutralized.

• the strength of the magnetic field increases.

• a short circuit occurs.