4.
(a) The force on the electron is
~
F
B
=
q~v
×
~
B
=
q
(
v
x
ˆ
i+
v
y
ˆ
j)
×
(
B
x
ˆ
B
y
~
j
)
=
q
(
v
x
B
y
−
v
y
B
x
)
ˆ
k
=(
−
1
.
6
×
10
−
19
C)[(2
.
0
×
10
6
m
/
s)(
−
0
.
15 T)
−
(3
.
0
×
10
6
m
/
s)(0
.
030 T)]
6
.
2
×
10
−
14
N)
ˆ
k
.
Thus, the magnitude of
~
F
B
is 6
.
2
×
10
14
N, and
~
F
B
points in the positive
z
direction.
(b) This amounts to repeating the above computation with a change in the sign in the charge. Thus,
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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, Force

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