EF3 Electromagnetism

Which lightbulb will turn on?

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What are the components of an electromagnet?

• wire, battery, steel core

• battery, magnet, closed circuit

• wire, circuit, switch

• none of these

In an electromagnet, wrapping a wire around a steel core and closing the circuit causes

• the electric field to create a magnetic field.

• an electronic field.

• a closed circuit and compass.

• a compass needle to move.

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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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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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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Bob made an electromagnet but it was very weak.  How can he make it stronger?

• take away a d-cell
• wrap the wire loosely
• use thicker wire
• use less winds

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Which rule explains why you would not use a brass rivet to make an electromagnet?

• opposites poles attract
• only iron and steel can become magnetized
• electricity flows from positive to negative
• metals conduct electricity

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Tim made an electromagnet with one d-cell and wrapped an uninsulated wire 30 times.  It did not work.  How could he fix it?

• wrap the wire more times
• include a switch
• use insulated wire
• use another d-cell

Magnetic poles and electric charges are similar in that...

• like poles repel and opposites attract
• magnetic force is equal to electric force