Theforceffrom electriceldfeandmagnekceldfhmustbe

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Unformatted text preview: 
length
travel
by
charge
along
v
 q
–
parKcle
charge
 Θ
–
deflecKon
angle
 t
–
travel
Kme

 u–velocity
component

 
perpendicular
to
v.
Induced
 
by
electric
field.
 ½
m
(v2
+
u2)
 E
 θ
 ½
m
v2
 H
 Measure
θ
as
a
funcKon
of
E
and
H
 L
 Determine
q/m
raKo
for
electron
 •  Apply
magneKc
field
H
to
avoid
deflecKon
of
electron
 beam
with
velocity
v
in
electric
field
E.
The
force
F
from
 electric
field
(F(E))
and
magneKc
field
F(H)
must
be
 equal.
F(E)=qE

F(H)=qvH.
Note
that
the
magneKc
force
 depends
on
the
velocity.
Hence,
we
can
determine
the
 velocity
from
the
relaKonship
:

F(E)=F(H)
‐>
...
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