the iron fillings will be attracted to the the magnetic lines of force and arrange themselves accordingly.
a bar magnet
speakers, earphones, telephones
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.
heat it or strike it with a hard blow
an object that attracts certain kinds of metals, such as iron
by passing a current through a wire wrapped around an iron core
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.
magnetic poles of opposite types (north and south) attract. Poles of the same type repel (north and north or south and south).
lines that show a magnetic field
poles
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.
no, an electromagnet is only magnetic when an electric current is flowing.
the relationship between magnetism and electricity
iron, nickel, cobalt
Lodestone (also acceptable: magnetite, iron oxide)
the area around a magnet in which magnetic forces can act
In magnetic items, the magnetic fields of the atoms line up. In nonmagnetized material, the magnetic fields of atoms do not line up.
take an iron wire and stroke it with a magnet
wood, copper, plastic, rubber, gold, glass, etc.
How does a compass use magnets to work?
What is the difference between a motor and and engine?
Why do farmers give their cows magnets to eat?
Name two ways to 'demagnetize' a magnet.
Explain how poles are attracted or repelled by each other.
What is a magnetic field?
What are the ends of the magnet, where the force is greater, called?
What is a magnet?
What type of magnet is the Earth?
What are lines of force?
What is electromagnetism?
How is an electromagnet created?
Is an electromagnet always magnetic? Explain.
How do you make a magnet?
What is the name of one naturally occurring magnet? Hint: Shown at the beginning of the chapter.
Name two materials that can be made into magnets.
How would lines of force be shown if you put a magnet under a sheet of paper and iron fillings on top?
Name three things that require electromagnets to operate.
What is the difference in the way the atoms are arranged between magnetic and non-magnetic items?
Name three materials that are not magnetic.
