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8-14. By using Ampere's circuital law, find the magnetic induction at dia- tance r from the center of a long wire carrying current I.

8-14. By using Ampere's circuital law, find the magnetic induction at dia- tance r from the center of a long wire carrying current I. Do this for both r > R and r < R, where R is the radius of the wire. Show explicitly that the magnetic induction vanishes on the axis of the wire.

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