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Finding Electric Field of Two Long Co-Axial Cylindrical Surfaces

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Two infinitely long coaxial cylindrical surfaces have the z axis as their common axis. The inner surface of radius a carries a surface current K1 = k1 phi, and the outer surface of radius b carries a surface current K2 = k2 phi. Both k1 and k2 are constant. Find B everywhere.

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The solution finds electric field of two long co-axial cylindrical surfaces.

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