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Magnets and Electromagnetism
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What is a magnet?
What is a magnet?
an object that attracts certain kinds of metals, such as iron
What are the ends of the magnet, where the force is greater, called?
What are the ends of the magnet, where the force is greater, called?
poles
What is the name of one naturally occurring magnet? Hint: Shown at the beginning of the chapter.
What is the name of one naturally occurring magnet? Hint: Shown at the beginning of the chapter.
Lodestone (also acceptable: magnetite, iron oxide)
Explain how poles are attracted or repelled by each other.
Explain how poles are attracted or repelled by each other.
magnetic poles of opposite types (north and south) attract. Poles of the same type repel (north and north or south and south).
Why do farmers give their cows magnets to eat?
Why do farmers give their cows magnets to eat?
Cows do not chew their food, so they often swallow metal objects. Magnets attract these objects so that the cows aren't injured by the objects.
What is a magnetic field?
What is a magnetic field?
the area around a magnet in which magnetic forces can act
What are lines of force?
What are lines of force?
lines that show a magnetic field
What type of magnet is the Earth?
What type of magnet is the Earth?
a bar magnet
How does a compass use magnets to work?
How does a compass use magnets to work?
the compass needle is a magnet, as is the Earth. The north pole attracts the north arrow of the compass needle, and it is drawn toward the north pole.
How would lines of force be shown if you put a magnet under a sheet of paper and iron fillings on top?
How would lines of force be shown if you put a magnet under a sheet of paper and iron fillings on top?
the iron fillings will be attracted to the the magnetic lines of force and arrange themselves accordingly.
Name three materials that are not magnetic.
Name three materials that are not magnetic.
wood, copper, plastic, rubber, gold, glass, etc.
How do you make a magnet?
How do you make a magnet?
take an iron wire and stroke it with a magnet
What is the difference in the way the atoms are arranged between magnetic and non-magnetic items?
What is the difference in the way the atoms are arranged between magnetic and non-magnetic items?
In magnetic items, the magnetic fields of the atoms line up. In nonmagnetized material, the magnetic fields of atoms do not line up.
Name two ways to 'demagnetize' a magnet.
Name two ways to 'demagnetize' a magnet.
heat it or strike it with a hard blow
Name two materials that can be made into magnets.
Name two materials that can be made into magnets.
iron, nickel, cobalt
What is electromagnetism?
What is electromagnetism?
the relationship between magnetism and electricity
How is an electromagnet created?
How is an electromagnet created?
by passing a current through a wire wrapped around an iron core
Is an electromagnet always magnetic? Explain.
Is an electromagnet always magnetic? Explain.
no, an electromagnet is only magnetic when an electric current is flowing.
Name three things that require electromagnets to operate.
Name three things that require electromagnets to operate.
speakers, earphones, telephones
What is the difference between a motor and and engine?
What is the difference between a motor and and engine?
motors use magnetic force to change electrical energy into kinetic (mechanical) energy. Engines change chemical energy (fuel) into kinetic energy (mechanical) to operate an automobile.
What is a Magnetic Resonance Imaging machine?
What is a Magnetic Resonance Imaging machine?
machine that uses computer controlled radio waves with a powerful doughnut-shaped magnet to create cross-sectional images of bodies.
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Go To The Final Question
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