Magnetic fields
Afield surrounding a permenant magnet or currentcarrying conductor
Likepoles repel
opposite attract
stronger where
field lines are
closer together
Arrows represent thedirection a free north pole would move
creating magnetic fields
In a wire moving charge creates a magneticfield
we can use right hand griprule to show the direction of the field
We also use clock notation to identify poles
South North in
o
Applied to a solenoid
S N
Flemming's lefthand rule
, N S
1,9 5get
Magnetic Flux density
F I as it's own field
current interaction F BILsino
Essino
Length of wire in the field
component of
F BII
F B strengthofmagnetic fieldcalled magnetic flux density B In unity
To
charged particles in a magnetic field
Electron classification tube Theforce experienced by a moving charged
particle in a magnetic field is 90 to it's
A screen direction of motion
vacuumtube
ng electronpath This produces a circular path once electrons
leave the field they leave on a tangent
wire
t.ie Etronspassanyla yiplane
Force on conductor EF BIL
ii Ti i
consider ve by
intimffe e distance moved
bye where u driftvelocityin wires or
of beam from electrongun
sub in EF B BNEV
NE.VE
for an individual electron
IF Bev F Bev
Afield surrounding a permenant magnet or currentcarrying conductor
Likepoles repel
opposite attract
stronger where
field lines are
closer together
Arrows represent thedirection a free north pole would move
creating magnetic fields
In a wire moving charge creates a magneticfield
we can use right hand griprule to show the direction of the field
We also use clock notation to identify poles
South North in
o
Applied to a solenoid
S N
Flemming's lefthand rule
, N S
1,9 5get
Magnetic Flux density
F I as it's own field
current interaction F BILsino
Essino
Length of wire in the field
component of
F BII
F B strengthofmagnetic fieldcalled magnetic flux density B In unity
To
charged particles in a magnetic field
Electron classification tube Theforce experienced by a moving charged
particle in a magnetic field is 90 to it's
A screen direction of motion
vacuumtube
ng electronpath This produces a circular path once electrons
leave the field they leave on a tangent
wire
t.ie Etronspassanyla yiplane
Force on conductor EF BIL
ii Ti i
consider ve by
intimffe e distance moved
bye where u driftvelocityin wires or
of beam from electrongun
sub in EF B BNEV
NE.VE
for an individual electron
IF Bev F Bev
