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_{0}is given in cartesian coordinates by:

B(x, y, z) = B

_{0}tanh (x/L) z where L is a constant.

a) Sketch Bz as a function of x/L.

b) What current density, j(x,y,z) produced this magnetic field?

c) Sketch any non-zero components of j as a function of x/L.

I'm not sure how to even start this question, let alone completing it. Could you please provide a detailed (Step by step) solution, which would help me learn?

Thanks