Magnetism Flashcards
what is a magnetic field
a region where magnetic materials experience a force
magnetic field lines go … north … south
from north into south pole
how to make a uniform magnetic field
placing a north and south pole of two permanent bar magnets near each other
how to find the magnetic field of something
iron fillings on top of a piece of paper with magnets underneath, shake it a bit so it gets stuck to the lines
both poles attract … materials that aren’t magnets
magnetic
when a magnet is brought near a magnetic material what happens
the material acts like a magnet, this magnetism has been induced with induced poles (closer they are the stinger with induced magnetism will be)
how to work out the direction of a magnetic field on a wire
right hand thumb rule (thumb pointing t direction of current and other diners directing magnetic field)
example of a soft magnetic material
iron
example of a hard magnetic material
steel
what happens when a current carrying wire is put between magnetic poles and the two magnetic fields affect one another?
a force acts upon the wire and can cause it to move
why can a current carrying wire move when put in between magnetic poles
as charged particles moving through the magnetic field will experience force as long as they’re not moving parallel to the field lines
for the wire to experience the full force of the magnetism when put between them what does it have to be
90 degrees to the magnetic field, cannot be placed along the field lines or it won’t experience any force at all
the force on the wire in-between the magnets always acts in the … relative to the magnetic field of the magnets and the … in the wire
same direction
direction of the current
(use flemings left hand rule)
reversing the current (ac) of the wire or the magnetic field that is between magnets does what
changes the direction of the wire’s resultant force
how to use Felming’s left hand rule
thuMb
Motion
First finger
Field (magnetic)
seCond finger
Current
