Electric and Magnetic Forces Review

A repelling force occurs between two charged objects when the charges are

• like signs

• opposite signs

• equal magnitude

• unequal magnitude

Tags

NGSS.MS-PS2-3

When your socks rub against carpet, they pick up many electric charges. Later in the day, these charges are no longer present on your socks. What most likely happened to the charges?

• The charges disappeared

• The charged switched signs

• The charges transferred to another object

• The charges broke apart into smaller particles

Tags

NGSS.MS-PS2-5

During a lightning storm, the bottom of a cloud gains a strong negative electric charge. Which of these describes the charge at the top of a tall metal pole directed under the cloud?

• The top of the pole would have no charge

• The top of the pole would have a positive charge

• The top of the pole would have a negative charge

• The charge of the pole would not be affected by the charge of the cloud.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

There are two spheres that both have electric charge of +1. Which statement describes the force that is exerted on the spheres due to their electric charge?

• There is a force pushing both objects to the left

• There is a force pulling the objects toward each other

• There is a force pushing the objects away from each other

• There is no force on the objects due to their electric charge being equal in magnitude

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

The diagram shows two pairs of charged objects. Object A and B are interacting with each other, and objects C and D are interacting with each other. Which of the following is true?

• There are no electric forces because the charges in each pair of objects cancel.

• The electric force between A and B is smaller than the electric force between C and D

• The electric force between A and B is greater than the electric force between C and D

• The electric force between A and B is identical to the electric force between C and D.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What happens when a rubber rod is rubbed with a piece of fur, giving the rod a negative charge?

• Negative charges are moved from the rod to the fur

• Negative charges are moved from the fur to the rod

• Negative charges are added to the rod and the fur remains neutral

• Positive charges are removed from the rod and the fur remains neutral

The distance between a positively charged object and a negatively charged object increases. If everything else remains constant, what happens to the electric force between the objects?

• The electric force decreases

• The electric force increases

• The electric force remains constant

• There is not enough information to answer this question

Tags

NGSS.MS-PS2-3

The attractive force between two magnets increases. Which statement explains why this would happen?

• The like poles of the magnets are pointed at each other and move farther apart

• The like poles of the magnets are pointed at each other and move closer together

• The unlike poles of the magnets are pointed at each other and move farther apart

• The unlike poles of the magnets are pointed at each other and move closer together

Tags

NGSS.MS-PS2-5

Which of the following determiner whether or not a material is magnetic

• The density of the material

• the weight of the material on Earth

• the alignment of atoms in the material

• the number of elements that make up the material

Tags

NGSS.MS-PS2-3

Candice claims that all magnets have two magnetic poles. Which of these observations would best support her claim?

• Iron is attracted to a magnet but not to other pieces of iron

• When a bar magnet is cut in half, each half has a north pole and a south pole

• The north pole of a compass needle is attracted to the south pole of a bar magnet

• The strength of the magnetic force from a bar magnet decreases as the magnet is pulled away from another object