An infinite length cylinder of radius b extending along the Z-axis and carrying a uniform volumetric current density J= az J, a cylindrical cavity of radius ? is made along the entire length of the cylinder such that its axis is displaced a distance ? from the axis of the main cylinder, as shown in the figure. Use superposition (by handling the cavity as a cylinder carrying current –J superimposed on the main current J that fill the entire cross section) to find the magnetic flux density inside the cavity

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