Magnets/Electricity Test

The glass rod has a  _______________ electric charge. The foam pieces have a  negative electrical charge.

• 1. positive

• 1. neutral

• 1. negative

• 1. same

Kim rubs a glass rod with a silk cloth. She moves the glass rod close to some foam. Look at the picture of the rod and foam.

The glass rod and the foam have an electric force between them. Since the charges of the two objects are different, it causes the glass rod and the foam to __________.

• 1. attract

• 1. repel

• 1. same

• 1. neutral

Ben does an experiment with a permanent magnet. He records his data in a chart. 

Which question was Ben most likely answering during his investigation?

• How many steel or iron objects can a magnet pick up?

• How strong is the magnetic force of a permanent magnet?

• What causes a permanent magnet to lose its magnetism?

• What kinds of materials are attracted to magnets?

Ben uses the magnet to try to pick up a large paper clip. The paper clip is made with steel. The magnet will not pick up the paper clip. This means the paper clip is too heavy. Ben should move the magnet _______the paper clip.

• closer to

• farther from

• neutral

• repel

Nina has two different magnets. Which problem can she solve using magnet X but not magnet Y?

• Small iron pieces need to be sorted from a mixture.

• The pull of the magnet on a piece of metal needs to be stronger.

• Steel objects need to be picked up from one location and dropped into a new location.

• The north pole of the magnet needs to attract the south pole of another magnet.

The picture shows the poles of magnets interacting. Circle the pairs of magnets that will attract each other. Choose two correct answers.

• 
• 
• 
• 

Look at the four highlighted areas around the magnet. Circle the two areas where the magnetic force is strongest.

• North Pole

• under the magnet

• off to the right of the South Pole

• South Pole

Paper clips are made of steel wire. The picture shows paper clips around two different types of magnets. Why are the paper clips bunched at the ends of each magnet?

• The magnetic force at the poles of each magnet are strongest, so they attract more paper clips.

• The paper clips are only touching the poles, so they are not attracted to other parts of the magnet.

• Some parts of each magnet repel the paper clips, but the poles of each magnet attract the paper clips.

• There is only current flowing through the ends of each magnet.