Electromagnets

Electromagnetism

By Bingxue Wang

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Hans Christian Oersted​If did this experiment in 1820. If you are a scientist, what do you find from this experiment?

Open Ended

​If you are a scientist, what is your conclusion?

Electromagnetism: The interaction between electric currents and magnetic fields.

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• Solenoid [ˈsōləˌnoid]: A coil of wire that carries an electric current, and therefore produces a magnetic field

• Electromagnet: Wrapping a solenoid around an iron core. It combines the magnetic field of both solenoid and iron core.

• ​The more loops, the stronger the magnetic field.

• Adding loops to the solenoid or increasing the electric current strengthens the electromagnet.

Multiple Choice

A magnet will pick up an object that is made of...

• plastic

• iron or steel

• glass

• copper

Multiple Choice

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

Multiple Choice

What is true about electricity and magnetic fields?

• Electricity is needed to create any magnet.
• Electricity always creates a magnetic field.
• Electricity is stronger than a magnetic field.
• Electricity prevents magnetic fields from occurring.

Multiple Choice

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.

Multiple Choice

A compass needle responds to a magnetic field, because the compass needle is a

• A. generator.
• B. motor.   
• C. magnet.
• D. transformer.

Multiple Choice

Which sides of the magnet repel each other?

• A) North and North Pole

• B) South and South Pole

• C) The North and South Pole

• D) A and B

• E) A, B,C

Multiple Choice

What happens when an electric current flows through a wire?

• The wire begins to spin.

• Nothing happens.

• A field of gravity is created around the wire.

• A magnetic field is created around the wire.

Open Ended

How do you describe electromagnetism?

Lifting and moving large metal objects containing iron

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Galvanometer:a meter that measures the strength and direction of an electric current in a wire.​ It contains an electromagnet between the poles of a permanent magnet.

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Magnetic resonance imaging (MRI) machines use powerful electromagnets and radio waves to produce detailed images of the body’s interior.

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​Some uses for electromagnets (read your handout)