History of Magnets
This naturally magnetic mineral was known to ancient civilizations.
what is magnetite?
These are the two ends of a magnet, called north and south.
What are magnetic poles?
These are tiny regions inside magnetic materials where many atomic magnetic moments are aligned.
What are magnetic domains?
This Danish scientist discovered that an electric current could affect a compass needle.
Who was Hans Christian Ørsted?
This household device uses an electromagnet to produce sound.
What is a loudspeaker?
This region of Turkey is associated with the discovery of naturally magnetic rocks.
What is Magnesia
What are magnetic poles?
What is attract?
This is the interaction between electric charges and magnets.
What is electromagnetism?
This instrument did Ørsted observe moving near a wire carrying electric current?
What is a compass?
This type of magnet produces magnetism using an electric current.
What is an electromagnet?
Who were the ancient Greeks
This is the region around a magnet where magnetic forces can be detected.
What is a magnetic field?
In an unmagnetized piece of iron, these regions are generally oriented in different directions.
What are magnetic domains?
Ørsted's discovery showed a connection between these two physical phenomena.
What are electricity and magnetism?
This is a coil of wire that produces a magnetic field when electric current flows through it.
What is a solenoid?
Natural magnets were found this many thousands of years ago
What is (more than) 2000?
These lines show the direction and shape of a magnetic field.
What are magnetic field lines?
This is a device that changes electrical energy into mechanical energy.
What is an electric motor?
This happens to the magnetic field around a wire when the direction of its electric current is reversed.
The magnetic field reverses direction.
Name one way to increase the strength of an electromagnet.
What is increasing the current or adding more turns of wire?
This ancient civilization used magnetite to make compasses that improved navigation.
Who were the Chinese?
What happens to magnetic force as the distance between two magnets increases?
Magnetic force generally becomes weaker as distance increases.
These two metals are commonly found in Earth's core and are important to Earth's magnetic field.
What are iron and nickel?
Ørsted's discovery helped establish this branch of physics, which studies the relationship between electricity and magnetism.
What is electromagnetism?
Why does an electromagnet usually lose most of its magnetism when its electric current is switched off?
Because the current that produces its magnetic field has stopped.