Shown on the right is the cross-section of an infinitely long cable extending in the z-direction that has a radius R and uniform current density j (current per cross-sectional area) that flows in the negative z-direction, but with a portion of it being carved out. The carved-out portion forms z an infinitely long cylindrical hollow whose radius is R/2 as shown in the figure. R/2 *A (a) Find the magnetic field, both magnitude and direction, at point A. R B (b) Find the magnetic field, both magnitude and direction, at point B.
Shown on the right is the cross-section of an infinitely long cable extending in the z-direction that has a radius R and uniform current density j (current per cross-sectional area) that flows in the negative z-direction, but with a portion of it being carved out. The carved-out portion forms z an infinitely long cylindrical hollow whose radius is R/2 as shown in the figure. R/2 *A (a) Find the magnetic field, both magnitude and direction, at point A. R B (b) Find the magnetic field, both magnitude and direction, at point B.
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