ch29-p070 - 70. (a) With cylindrical symmetry, we have,...

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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 surface. ...
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