The figure below is a cross-sectional view of a coaxial cable. The center conductor is surrounded by a rubber layer, which is surrounded by an outer conductor, which is surrounded by another rubber layer. In a particular application, the current in the inner conductor is 1.86 A out of the page, and the current in the outer conductor is 2.13 A into the page.(adsbygoogle = window.adsbygoogle || []).push({});

FIGURE: http://east.ilrn.com/graphing/bca/user/appletImage?dbid=802444537 [Broken]

(a) Determine the magnitude of the magnetic field at point a.

(b) Determine the magnitude of the magnetic field at point b.

I got part a, which is (mu*I1)/(2*pi*.002). I can't seem to get the right answer for part b. I tried (mu*I2)/(2*pi*.006), where I2 equals the current of the outer conductor. Also, I tried (mu*I3)/(2*pi*.002). All these still give me the wrong answer. What am I doing wrong?

Please help me...Any help would be greatly appreciated! :)

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# Homework Help: Magnetic field of a coaxial cable

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