The current density inside a cylindrical wireof radius R changes as j = ar, r being the radial distance to thecenter of the wire and a being a constant.(a) Calculate the curent in the wire at a distance r from the centerof the wire.i(b) What is the magnitude of the magnetic field produced by thecurrent at a distance r inside the wire?(c) Calculate the magnitude of the magnetic field at a distance routside the wire.(d) Graph B(r) as a function of r fromr = 0 to r = 3R.

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