Static electricity is the buildup of charges between two objects. What best explains why a balloon is attracted to hair when the two have been rubbed together?

Which of the following most closely resembles an electromagnetic?

Two bar magnets are held close together. They are released and allowed to move freely. The bar magnets quickly come together. Which best explains why this happens?

Frederick sets paper clips out on a table. He then takes a magnet, places it directly beneath the paper clips under the table, and moves the magnet. He finds that the paper clips move with the magnet. Why does this happen?

Surrounding each magnetic is an invisible force field called

In an electromagnet, coils of wire are wrapped around a magnetic object to generate a magnetic field. What the is relationship between number of coils and the strength of the magnetic field?

To decrease the strength of a magnetic field around an electromagnet, we must

What is the cause of electricity?

When electrons in magnetic domains all spin in the same direction, they create an invisible force known as_______

Two magnets pull on each other. What can make the magnets pull with LESS force?

Students rubbed a balloon across a square carpet to give it an electrical charge. They found the charged balloon could pick up pieces of paper.

What data could they collect to decide if the electric charge is getting stronger?

Students attach magnets to toy race cars. They want one car to push another car without touching it. How can the students arrange two cars so they will push each other without touching.

Which object demonstrates the way a magnet is used?

A directional flow of electric charge

Matter with a surplus of electrons

The size of something

When the currents of two electromagnets are increased, the size of the force is _____________.

Which of the following observations can be used to indicate the strength of the current created by the generator?

Students removed a large magnet from an old speaker. The students held the magnet a few inches above some iron tacks, and they jumped up and attached to the magnet. When the students pulled the tacks off the magnet, some of them remained stuck to each other.

Which observation provides evidence that a magnetic force can act across a distance?

Students attached both ends of a long wire to the poles of a battery and wrapped the wire around a spoon. In this arrangement, the spoon is able to pick up five paper clips.

The students wrap more wire around the spoon and want to determine if the strength of the magnetic force has increased. Which of the following observations would indicate that wrapping more wire has increased the strength of the electromagnet?