Physics Unit 3 Flashcards
What term is used to describe how easily materials can be magnetized?
Permeability
A material that cannot be magnetized because the electrons all spin in different directions is called a_____ material
Non-magnetic
When using the left hand thumb rule for straight conductors, the fingers encircling the wire indicate
Direction of magnetic field
Materials that are weakly repelled by magnets area classified as what type of magnet
Diamagnetic
The term “electromagnetic induction: refers to the production of
An electric current
Ferromagnetic
Iron, cobalt, and nickel
Nonmagnetic
Wood, plastic, and glass
Diamagnetic
Beryllium, bismuth, and lead
Paramagnetic
Gadolinium, platinum, and aluminum
The north pole of a magnet will be attracted to the north pole of another magnet
False
T/F no matter how many pieces a magnet is cut into, each piece will have a north and south pole
True
T/F the more closely spaced, the lines of magnetic flux, the weaker the field
False
Which person discovered electromagnetic induction
Faraday
Which of the following types of magnets are considered temporary
Electromagnets
The more coils or numbers of turns a conductor has, the _____ the electromagnetic force
Greater
The unit of measurement of magnetic flux is the
Weber
Lines of force, on the external surface of a magnet, move from the___pole to the _____pole
North, south
A coiled helix, carrying an electrical current is known as a
Solenoid
What is the difference between an electromagnet and solenoid?
An electromagnetic has a ferromagnetic core, and a solenoid has no core
In a straight conductor, when the conventional current is flowing out of a piece of paper, lying on the table, what direction will the magnetic field be traveling?
Counter clockwise
Which of the following statements is true regarding the strength of induced current
The faster the conductor, the stronger the current
What principle does the auto transformer work?
Electromagnetic self induction
What device varies the voltage that will go to the step up transformer
Auto transformer
What is the difference between a step up transformer in the auto transformer?
The auto transformer only has one coil