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Suppose B in a region of space centered on the origin has cylindrical symmetry and is given by
B = B, ộ where Bo is a constant, and ô is the azimuthal direction in cylindrical coordinates.
i) What is the current density in this region of space?
ii) Suppose the current density that you found extends out to a radius R and is zero for r>R.
What is the magnetic field for r > R?

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