Magnetism Flashcards
The ability of a material to attract iron, cobalt or nickel
Magnetism
What type of magnet is the earth?
Natural
What type of magnet is a pierce of hard steel that has been artificially magnetized?
Artificial
Use temporary magnets produced by means of an electric current
Electromagnets
The lines of force in a magnetic field are called
Flux lines
Which way to flux lines travel inside the magnet?
South to north
Which way do flux lines travel outside the magnet?
North to south
1st law of Magnetism
Every magnet has 2 poles
2nd law of Magnetism
Like poles repel, unlike poles attract
3rd law of Magnetism
The force of attraction or repulsion between two magnetic poles varies directly as the strength of the poles and inversely as the square of the distance between them
The strength of the magnetic feild is measured in
Tesla
Not attracted to magnetic fields at all
Nonmagnetic
Weakly repelled by magnetic fields
Diamagnetic
Weakly attracted to magnetic fields
Paramagnetic
Strongly attracted to magnetic fields
Ferromagnetic
If 2 bar magnets are suspended in space, what would happen?
They would rotate and attract
A lodestone is an example of a
natural magnet
What is an example of a ferromagnetic material?
Iron
North to north poles would
repel
North to south poles would
Attract
When iron is fabricated into a magnet, magnetic domains will
align
a coil wound into a tightly packed helix
Solenoid
more coils means a _______magnetic feild
stronger
The intensity of the magnetic field must be ________ to induce a current flow
Alternating
4 Factors that induce electromagnetic force
Speed, Strength, Angle, Number of turns
Faster speed equals _________ force
more
Stronger cuts equals _________ force
more
the induction of electricity in a secondary coil by moving a magnetic field
Mutual Induction
Mutual Induction has to have which type of current?
Alternating
a device that converts some form of mechanical energy into electrical energy
Generator
devices used to increase or decrease voltage through induction
Transformer
The input side or primary coiled is
supplied with AC
The output side of secondary coil
develops AC by mutual conduction
A step up transformer increases
voltage
A step down transformer increases
Amperage
A step up transformer decreases
Amperage
A step down transformer decreases
Voltage
Heavily insulated coiled wound around a circle or square
Closed core
Both primary and secondary could are wound around a central core
Shell type
process by which the magnetic field of a coil induced an electromagnetic field in the coil itself
self induction
operates on the principle of self induction
Auto transformers
