A very long, straight conductor with a circular cross section of radius R carries a current I.

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A very long, straight conductor with a circular cross section of radius R carries a current I. Inside the conductor, there is a cylindrical hole of radius a whose axis is parallel to the axis of the conductor a distance b from it (Figure). Let the z axis be the axis of the conductor, and let the axis of the hole be at x = b. Find the magnetic field B at the point

(a) On the x axis at x = 2R, and

(b) On the y axis at y = 2R.

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