A long, hollow, cylindrical conductor (inner radius 3.0 mm, outer radius 6.0 mm)

Question

A long, hollow, cylindrical conductor (inner radius 3.0 mm, outer radius 6.0 mm) carries a current of 14 A distributed uniformly across its cross section. A long thin wire that is coaxial with the cylinder carries a current of 14 A in the opposite direction. What is the magnitude of the magnetic field:

A long, hollow, cylindrical conductor (inner radius 3.0 mm, outer radius 6.0 mm) carries a current of 14 A distributed uniformly across its cross section. A long thin wire that is coaxial with the cylinder carries a current of 14 A in the opposite direction. What is the magnitude of the magnetic field: 1.5 mm from the central axis? 4.5 mm from the central axis? 7.5 mm from the central axis? only need Part B

Explanation / Answer

B = uo(i1+i2)/2pi d

B =12.56*10^-7 28/2*3.14*0.0045

B=6.222*10^-4 T or 0.0006222 T

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