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8. From Sample Problem 321 we know that
B
∝
r
for
r
≤
R
and
B
∝
r
–1
for
r
≥
R
. So the
maximum value of
B
occurs at
r = R
, and there are two possible values of
r
at which the
magnetic field is 75% of
B
max
. We denote these two values as
r
1
and
r
2
, where
r
1
<
R
and
r
2
>
R
.
(a) Inside the capacitor, 0.75
B
max
/
B
max
=
r
1
/
R
, or
r
1
= 0.75
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 Spring '08
 Any
 Physics

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