Chpt 5 Part 2 Flashcards
When and who discovered magnetite
1000 B.C., shepherds and dairy farmers of village of magnesia (western turkey)
what is a magnetic oxide of iron?
magnetite
example of a lodestone or “leading stone”
magnetite
What is a naturally occurring magnet and was used as a compass by ancient people
magnetite
Any _________ in motion creates a magnetic field
charged particle
the magnetic field of a charged particle is _____ to the motion of that object
perpendicular
if the particles motion is a closed loop, the magnetic field lines will be perpendicular to the _________
plane of motion
Electrons rotate on an _____
axis
(T/F) Spinning electron charge is the basis for CT
False
MRI
What creates a property called spin?
electrons rotating
_____ creates a magnetic field which is neutralized if an ____________ exists in any shell
spin
electron pair
Atoms having an odd number of what in any shell exhibits a small magnetic field?
electrons
the lines of a magnetic field are always what?
closed loops
(T/F) Magnetic fields are called bipolar or dipolar since they always have a north and south pole
True
A small magnet created by the electron spin is called what?
Magnetic dipole
An accumulation of many dipoles aligned creates what?
magnetic domain
one domain = ? atoms
10^15
Usually, magnetic domains are ________ distributed
randomly
What causes the magnetic domains to align in an object, causing it to act like a magnet?
external magnetic field
Ferrous materials have ______ domains but in _________ directions
many
different
When a magnetic comes in close proximity to a ferrous material what happens?
it lines up the domains and makes it magnetic
When a magnetic comes in close proximity to a non-ferrous material what happens?
nothing happens (no domains to align)
the magnetic dipoles in a bar magnet generate what?
imaginary lines of a magnetic field
Lines of flux flow what way outside a magnetic, and what way inside the magnet
Outside: N to S
Inside: S to N
