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8. (a) Letting
~
F
=
q
(
~
E
+
~v
×
~
B
) = 0, we get
vB
sin
φ
=
E
. We note that (for given values of the Felds)
this gives a minimum value for speed whenever the sin
φ
factor is at its maximum value (which is
1, corresponding to
φ
=90
◦
). So
v
min
=
E/B
=(1
.
50
×
10
3
V
/
m)
/
(0
.
400 T) = 3
.
75
×
10
3
m
/
s
.
(b) Having noted already that
~v
⊥
~
B
,wenowpo
in
tou
ttha
t
~v
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
 Fall '08
 SPRUNGER
 Physics

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