Magnetism and electromagemtis Flashcards
bar magent…
north pole and south
when is magnetic field strongest
at the poles of magent
what happens if bring2poles close togehter
exter force on each other
what does 2like poles do
repel , force of repulsion - force cause magnet apart
what does 2unlike poles do
attract
whta are example of non-contact force on magent
and why
attraction and repulsion betwen 2 magnetic poles, becayse magent do not have to touch to experience the force.
what is permanent magenet and
example
produces its own magnetic field
-bring permanent magent close to another one, can attract or repel depending on direction
what is induced magnet
object become a magnet when placed in magnetic field
what happens when remove induced magnet from magentic field
induced magent loses most/all of its magnetism quickly
what force causes induced magnet
force of attraction
example of induced magnet
2object not magnetic, place in permanetn magnet between them makes a magnetic field around. Causes the 2object induced magnet.
diagram of permanet and induced magnet
what direction is poles of arrow going
always north to south
when does field show strongest
the lines getting closer
what does the compass needle points in direction to
earths magnetic field
why is their earth magentic field
due to earth core
4types of magnetic material
what can it be made into
iron, steel (ally of iron),cobalt, nickel
- permanent or induced magnet
what is a magnetic field
region around a mgent where force acts on another magnet or on a magnetic material.
what is the force between magnet and magnetic material
force is always one of attraction
the strentgh of magnetic field depend on
- distance from magnet
-distance from wire
-current through wire
further from magnet…
experince force of attraction still but smaller than force closer to magnet
what is magnetic compass
contain small bar magnet
what happens if place magnetic compass near magnet
plots magnetic field
method of plotting magnetic field pattern of magnet use compass
- Place bar magnet and compass on a peice of paper
- Mark where compass points to
- Keeping magnet in same place, move compass to marked point
4.Repet these steps until go back to magnet - Join up all the points
- add arrow in direction from north to south pole
- repet steps for above and below the bar magnet
when is magnetic fiedl produced around wire
when current flows through conducting wire
how to show magnetic field produce around wire by compass
- current off - compass needle lines up with earths magnetic field
- turn current on - compass needle deflects = proves magnetic field
large current + closer to wire =
stronger magnetc fiedl
what is solenoid
formed by shaping a wire
magnetic field inside solenoid is…
strong and uniform
how does soleniod increase strnegth of magentic field
- increase zie of current=increase strength field
-increase number of turns of coil (will be greate than previous one)
-piece of iron inside
what is soleniod shape simialr to
bar magnet
what is electromagnet
a solenoid with iron core
why is electromagnet useful
because can change the strentgh of magnetic field by change size f current.
-turn of and off
diagrame of soleniod
