Circular Pipe A long circular pipe with outside radius R carries a (uniformly di

Question

Circular Pipe A long circular pipe with outside radius R carries a (uniformly distributed) current i into the page as shown in Fig. 30-46. A wire runs parallel to the pipe at a distance of 3R from center to center. Find the magnitude and direction of the current in the wire such that the net magnetic field at point P has the same magnitude as the net magnetic field at the center of the pipe but is in the opposite direction. (Use any variable or symbol stated above along with the following as necessary: 0.)
Magnitude

iwire =

Direction

Explanation / Answer

a similar question is solved in the link below hopefully this may help you http://www.cramster.com/answers-mar-10/physics/amperes-law-figure-29-71-long-circular-pipe-radiu_807959.aspx

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