Question

wire in a coaxial cable carries current 2.00 A in one direc- tion, and the sheath around it carries current 2.00 A in the opposite direction. What magnetic field does the cable cre- e at points outside the cable? A lona, culindrical conductor of radius R carries a cur- t I as shown in Figure-P30.36. The current-density J, however, is net- unform over the cross section of the con- ductor but rather is a function of the radius according to J = br, where b is a constant. Find-nexpression for the magnetic field magnitude B (a) at a distance r < R and led ur- any ent ain (b) at a distance ry >R measured from the center of the conductor. the d an rge- kA. roid (S
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nsi de the cylinder),cross-sectional Forr <R(i areais, The expression for current density is According to the amperes law.the

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