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24. (a) Fig. 3235 indicates that
i
= 4.0 A when
t
= 20 ms.
Thus,
B
i
=
µ
o
i
/2
π
r
= 0.089 mT.
(b) Fig. 3235 indicates that
i
= 8.0 A when
t
= 40 ms. Thus,
B
i
≈
0.18 mT.
(c) Fig. 3235 indicates that
i
= 10 A when
t
> 50 ms. Thus,
B
i
≈
0.220 mT.
(d) Eq. 324 gives the displacement current in terms of the timederivative of the electric
field:
i
d
=
ε
o
A
(
dE/dt
), but using Eq. 265 and Eq. 2610 we have
E
=
ρ
i/A
(in terms of the
real current); therefore,
i
d
=
ε
o
ρ
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics

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