solve in brief

Image text transcribed for accessibility: A ring of radius a is centered in the x-y plane at z = 0 and has 1 A of current in the +aPhi direction. An infinite length line of current exists at z = 0, y = 2a. Determine the magnitude and direction of current needed in this infinite length line to make the magnetic field at the origin equal to 0. (Answer: 2pi A in the +ax direction)

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