P27_065.PDF

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Chapter 27 - 27.65
65. The electric field points towards lower values of potential (see Eq. 25-40) so E is directed towards point
B (which we take to be the ı direction in our calculation). Since the field is considered to be uniform
inside the wire, then its magnitude is, by Eq. 25-42,
|
E
|
= |
∆ V
|
= 50
200 =0 . 25 V / m .
L
Using Eq. 27-11, with ρ =1 . 7
×
10 − 8 Ω
·
m, we obtain
E = ρ J =
⇒
J =1 . 5
×
10 7 i
in SI units (A/m 2 ).
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