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1. (a) The force on the electron is
()
( ) ( )
19
6
6
14
ˆˆ
ˆ
ˆ
ij
i
k
=
1.6 10
C
2.0 10 m s
0.15 T
3.0 10 m s 0.030 T
ˆ
6.2 10
N k.
Bx
y
x
y
x
y
y
x
F
q
v B qv
v
B
Bj
qvB vB
−
−
=×
=
+
×
+
=
−
⎡⎤
−×
×
−
−
×
⎣⎦
GG
G
G
Thus, the magnitude of
G
F
B
is 6.2
×
10
14
N, and
G
F
B
points in the positive
z
direction.
(b) This amounts to repeating the above computation with a change in the sign in the
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 Spring '08
 Any
 Physics, Force

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