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Unformatted text preview: 70. (a) With cylindrical symmetry, we have, external to the conductors, B= µ 0 ienc
2π r which produces ienc = 25 mA from the given information. Therefore, the thin wire must
carry 5.0 mA.
(b) The direction is downward, opposite to the 30 mA carried by the thin conducting
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- Spring '08