Maglev devices are efficient because there is no ___________.
What is friction.
100
Like poles of a magnet ________________.
What is repel.
100
Unlike poles of a magnet __________________.
What is attract.
100
Earth is a giant _______________ magnet.
What is permanent.
100
The closer together the lines of a magnetic field, the stronger the _______________________.
What is magnetic force.
200
Whenever an electric charge moves, it creates ______________ forces.
What is magnetic.
200
An electromagnet works because moving ___________
generate magnetic forces.
What is electrons.
200
An electric current that produces a magnetic field.
What is electromagnet.
200
The ability of an object to push or pull on another object that has the magnetic property.
What is magnetism.
200
How the poles of a magnet are identified.
What is North and South.
300
______________devices operate by using electromagnets to push and pull objects apart by rapidly switching the poles of the magnets.
What is Maglev.
300
Three primary metals attracted to magnets.
What is Iron, Cobalt and Nickel.
300
Used to turn the axle of a generator.
What is energy.
300
Electric current that rapidly changes directions.
What is alternating current.
300
A device that lowers the voltage of electricity.
What is transformer.
400
Lifting of an object by means of magnetiic forces.
What is magnetic levitation.
400
____________ also act like magnets.
What is Atoms.
400
A device that creates electric current by spinning an electric coil between the poles of a powerful magnet.
What is a generator.
400
A magnetic field goes in _____________ around a straight wire when current is flowing through it.
What is circles.
400
Wrapping many loops of wire together ____________
the magnetism of the coil.
What is increases.
500
An electric magnet is different from a permanent magnet because an electromagnet
A) is magnetic.
B) can push and pull.
C) can attract some metals.
D) can turn on and off.
What is D - turn on and off.
500
In a generator work is done on the ____________.
What is axle.
500
Other form of energy that magnetism is related to.
What is electricity.
500
A _________________ vibrates next to a permanent magnet to create sound in a speaker.
What is voice coil.
500
All of these increase the strength of an electromagnet except:
A) increasing the number of loops.
B) adding an iron rod in the middle.
C) increasing the resistance.
D) increasing the electric current.