1. Metal paper clips do not attract or repel each other. When an electromagnet is placed nearby, the paper clips can be observed to move toward it. Which statement describes this phenomenon? Paper clips turn into permanent magnets after exposure to a magnetic field.

The electromagnet reacts to the strong force of attraction from paper clips.

Electrons flow freely into the magnetic field, causing the paper clips to move.

Magnetic domains within the paper clips align with the magnetic field.

2. An electromagnet is built using a 9-volt battery with conducting wire connected to a switch and coiled around an iron nail. A pile of metal paper clips is moved close to the iron nail, yet no attraction is apparent between the electromagnet and the paper clips. What is the most likely conclusion to explain this result?

The switch is turned off.

The switch is turned on.

The paper clips are made of a nonmagnetic metal.

There are not enough coils of wire around the iron nail.

3. An experiment modeled the interaction between magnetic force and the change of energy of an object influenced by the magnetic force. The experiment’s researchers observed that the metal wheels of a small car turned as they experienced the force exerted by a magnetic field, drawing the car closer to the magnet. What energy is being gained by the car?

electrical energy

potential energy

kinetic energy

thermal energy

4. Which statement about the current and magnetic field correctly describes this figure as well as all electromagnets?

The current generates and is perpendicular to the magnetic field.

The current, which points upward, is generated by the sporadic magnetic field.

The current generates the magnetic field and is parallel and opposite to the direction of the magnetic field.

The current generated by the magnetic field is parallel and points in the same direction as the magnetic field.

5. Domains are the regions in a material in which the magnetic fields of many of the atoms are aligned facing the same direction. What is the relationship between the electrical current and the alignment of atoms responding to the current?

As current increases, the alignment reverts to its random arrangement.

As current decreases, the alignment becomes continuous.

The alignment of atoms has nothing to do with the changing current.

As current increases, the alignment becomes more organized.