NGSS.MS-PS2-3

What makes a charged balloon stick to the wall?

• Protons transferred to the balloon when it was rubbed on metal.
• Extra electrons on the surface of the balloon push away electrons in the wall, leaving a positively charged area.
• The rubber in the balloon has a magnetic field that pulls on the wood in the wall.
• Electricity in the balloon creates a magnetic field that attracts the metal in the wall.

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Where is the force of attraction the strongest on a magnet?

• at the poles
• in the middle
• above the magnet
• below the magnet

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This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.
• Use a smaller battery.
• Reverse the poles of the magnet.
• Remove all the coils and the nail.

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Charges that are alike _________ or push apart. 

• Repel
• Attract

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If you place the North pole of a magnet next to the South pole of another magnet, they will:

• Attract
• Repel
• Do nothing
• Shatter

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Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.

• +,+
• +,-
• -,+
• -,-

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NGSS.MS-PS2-3

Ms Jo Jo rubbed two balloons with a piece of wool. What will happen when the balloons are brought near each other?

• The balloons will repel each other.
• The balloons will attract each other.
• The balloons will become positively (+) charged.
• The balloons will pop.

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To make this electromagnet stronger you could:

• use less wire

• have fewer wire coils around the nail

• have more wire coils around the nail

• use a plastic core

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What two forces are required for generators and electric motors to work? 

• magnetism and thermal 
• electricity and thermal 
• electricity and magnetism 
• magnetism and radiant 

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Which of the following is flowing through the electromagnet above?

• electric current

• magnetic current

• magnetic energy

• chemical energy

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