In this problem, we are dealing with the magnetic field produced by straight currents. We'll use amperes law to determine the magnetic field around a current.
B•∫dl = μ0Ienc
A coaxial cable consists of a solid inner conductor of radius R1 surrounded by a concentric cylindrical tube of inner radius R2 and outer radius R3 (the figure). The conductors carry equal and opposite currents Io distributed uniformly across their cross sections (Figure 1).
Let Io = 1.50 A, R1 = 1.00 cm, R2 = 2.00 cm, and R3 = 2.50 cm. Graph B from R = 0 to R = 3.00 cm.
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Based on our data, we think this problem is relevant for Professor Shaevitz's class at Barnard College.