Electromagnets at Work and Maglev Trains

Which words from paragraph 2 help the reader know what the word repel means?

• the magnets stick together

• opposite ends attract

• connect a north pole to a south pole

• they push each other away

The prefix dis in the word disconnect means "not" or "lack of." Based on this information, the reader can tell that disconnect means —

• not accurate

• not linked or joined

• a lack of effort

• not in a group

What is paragraph 3 of "Electromagnets at Work" mainly about?

• Uses for an electromagnet

• How electromagnets are like magnets

• How to make an electromagnet

• Electric currents

Based on information from the selection, which of the following is not a way to make an electromagnet stronger?

• Coiling more wire around an iron core

• Using a stronger power source

• Using a larger battery

• Stopping the flow of electric current

Why does the author think electromagnets are better than magnets?

• Electromagnets work the same way magnets do.

• Electromagnets can lift cars.

• Electromagnets can be controlled.

• Magnets cannot pull trains.

What does the diagram tell the reader about electromagnets?

• The length of the nail needed to build an electromagnet

• The materials needed to create an electromagnet

• The type of battery needed as a power source for an electromagnet

• The thickness of wire needed to design an electromagnet

The author organizes this selection by —

• describing how an electromagnet works and how to make one

• listing objects that contain an electromagnet and classifying each object

• comparing and contrasting electromagnets with ordinary magnets

• sequencing the steps of an investigation

Based on information from 'Electromagnets at Work,' the reader can conclude that a wooden stick could not be used as the core of an electromagnet because —

• it is not smooth

• an electric current will cause the stick to burn

• a stick is not made of iron

• wire cannot be wrapped around a stick

Which words from paragraph 2 help the reader know what the word levitation means?

• float over a path

• able to move faster

• rail tracks that guide them

• there is little friction

Based on information from 'Maglev Trains,' the reader can conclude that —

• regular trains move faster than maglev trains because of friction

• regular trains move slower than maglev trains because they do not float

• electromagnets cause regular trains to move along a path

• maglev trains have engines