P27_065 - 65. The electric field points towards lower...

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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 ı inside the wire, then its magnitude is, by Eq. 25-42, |E | = |∆V | 50 = = 0.25 V/m . L 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 i ...
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