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Unformatted text preview: 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 ˆ 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 |
= 0.25 V/m .
200 Using Eq. 27-11, with ρ = 1.7 × 10−8 Ω·m, we obtain
E = ρJ
in SI units (A/m2 ). =⇒ J = 1.5 × 107 ˆ
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- Fall '08