Electric and Magnetic Forces and Fields in Everyday Life Such as Generators, Motors and Transformers

What is an electromagnet?

• a temporary magnet made from current carrying wire around a magnetic metal core.
• a permanent magnet with a north and south pole

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What makes an electromagnet stronger?

• Increase the number of wire wraps around the iron core
• decrease the strength of the power source
• remove the source of current
• lightning bolts hitting a tree

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What is the relationship between electrical current and magnetic field strength in an electromagnet?

• When current is increased, magnetic field strength increases
• When current is increased the strength of magnetic field decreases

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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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Which of the following is NOT part of an electromagnet?

• Wire
• Iron
• Toothpick
• Power source

Which of the following is shown in the picture?

• Electromagnet
• Electric generator
• Electric motor
• Transformer

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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

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What is magnetism?

• Energy created by magnets
• A force created by magnets
• A contact force
• An invisible force that attracts electrically charged particles

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What are the ends of a magnet called?

• East and west poles
• Left and Right ends
• North and South ends
• North and South poles

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What is the name of the force that attracts or repels materials?

• current
• electricity
• magnetism

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