Electricity and Magnetism

Which of the following best describes electric charge?

• a force that causes objects to heat up

• a high-voltage material that can cause damage to objects

• a fundamental property that causes electric and magnetic interactions

• a particle that moves freely through matter and causes static electricity to build up on objects

Tags

NGSS.MS-PS2-3

Peter’s teacher tells him that he should not place his electric stereo near the edge of a pool because the water in the pool is a conductor. What does she mean when she says that the water is a conductor?

• Water is a type of electrical energy.

• Water damages electric circuits.

• Electric charges cannot flow without water.

• Electric charges move through the water in the pool.

When Bethany walks across a carpet, her socks pick up many negative electric charges. Later in the day, these negative charges are no longer present on her socks. What most likely happened to the negative charges?

• The charges disappeared.

• The charges transferred to another object.

• The charges switched from negative to positive.

• The charges broke apart into smaller positive and negative particles.

An engineer is building an electronic device. She wants to use a material that will give her the most control over the amount of electric charge that flows through a circuit. Which material should she use?

• a conductor

• an insulator

• a semiconductor

• a tube

Tags

NGSS.MS-ETS1-2

The following image shows two circular objects. Each object has an electric charge, as shown:

What will happen to these objects when they are placed near each other?

• The objects will remain still.

• The objects will both move to the left.

• The objects will move towards each other.

• The objects will move away from each other.

Tags

NGSS.MS-PS2-3

Electromagnets can be

• turned on and off

• made stronger

• made from iron

• made weaker

Metal is a good conductor

• True

• False

Wood is a good conductor.

• True

• False

If the magnets above were brought close together they would…

• attract each other with a a strong force

• repel each other with a strong force

• attract each other with a weak force

• repel each other with a weak force

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

How do objects become negatively charged?

• They gain electrons

• They lose electrons

• Rubbing or Friction