Two large, flat current-carrying sheets are placed parallel to each other, one sheet above the other. The upper sheet carries a current \(1.0 \mathrm{~A}\) per unit of width to the left, and the lower sheet carries a current 3.0 A per unit of width to the right. Calculate the magnitude of the magnetic field

(a) between the sheets,

(b) above the upper sheet,

(c) below the lower sheet.

(d) Draw a diagram showing the direction of the magnetic field in each of these regions.