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39. The magnetic field
B
can be expressed as
Bt
B
B
t
bg
b
g
=+
+
01
0
sin
,
ωφ
where
B
0
= (30.0 T + 29.6 T)/2 = 29.8 T and
B
1
= (30.0 T – 29.6 T)/2 = 0.200 T. Then
from Eq. 3025
E
dB
dt
r
rd
dt
BB
t
B
r
t
=
F
H
G
I
K
J
+
=
+
1
22
1
2
0
1
0
cos
.
ω
We note that
= 2
π
f
and that the factor in front of the cosine is the maximum value of
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 Spring '08
 Any
 Physics

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