Magnetism and Electromagnets

How are electromagnets different from magnets?

• magnets can be turned on/off
• you can turn an electromagnet on/off
• magnets are more powerful
• magnets have a North and South pole

Like poles on a magnet

• attract
• repel

Unlike poles on a magnet

• repel
• attract

What is this?

• magnet
• electromagnet
• series circuit
• parallel circuit

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How do you make an electromagnet stronger?

• Add a motor and/or lightbulbs
• Add more light bulbs and/or wire coils
• add more wire coils and/or a switch
• add more wire coils and/or batteries

In order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.

• wire, iron, electric
• electric, wire, iron
• iron, electric, wire
• excited, hair, apple

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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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Electricity can be used to create a magnet

• True
• False

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Magnets stick to any materials that are made of

• Iron, Nickel, Copper
• Iron, Nickel, Cobalt
• Ions, Nickel, Cobalt
• Iron, Lead, Cobalt

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What is the compass aligned to initially? (when the wire is not connected to the battery)

• Earth's magnetic field

• The magnetic field of the battery

• The magnetic field of the wire