ch29-p045 - 45. We use Eq. 29-20 B = µ 0ir / 2π a 2 for...

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Unformatted text preview: 45. We use Eq. 29-20 B = µ 0ir / 2π a 2 for the B-field inside the wire ( r < a ) and Eq. 29-17 B = µ 0i / 2π r for that outside the wire (r > a). (a) At r = 0, B = 0 . (b) At r = 0.0100m , B = µ 0ir (4π×10−7 T ⋅ m/A)(170A)(0.0100m) = = 8.50 ×10−4 T. 2 2 2π a 2π (0.0200m) (c) At r = a = 0.0200m , B = (d) At r = 0.0400m , B = µ 0ir (4π×10−7 T ⋅ m/A)(170A)(0.0200m) = = 1.70 ×10−3 T. 2π a 2 2π (0.0200m) 2 µ 0i (4π×10−7 T ⋅ m/A)(170A) = = 8.50 ×10−4 T. 2π r 2π (0.0400m) ...
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