P30_022 - r away From the wire carrying current i and is d...

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22. Since they carry current in the same direction, then (by the right-hand rule) the only region in which their felds might cancel is between them. Thus, iF the point at which we are evaluating their feld is
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Unformatted text preview: r away From the wire carrying current i and is d r away From the wire carrying current 3 i , then the canceling oF their felds leads to i 2 r = (3 i ) 2 ( d r ) = r = d 4 ....
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