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Thanks for your help guys. I couldn't find an answers. Turns out heaps of guys in my class couldn't get it. Do you think this is too advanced for a second year physics degree?

Hi there, 2nd year student, absolutely stumped on this don't even know where to begin. [I]"Determine the vector potential due to an infinite cylinder of radius, R, carrying a uniform current density, j. Use this to describe the magnetic field inside a current carrying wire I am using...