Establish similarities and differences between pairs of vectors of electric field strength E and magnetic induction B, displacement D and magnetic field strength H, polarization P and magnetization I in their connection: 1) with charges (any, only free or only polarized) on one side and with currents (any, only external or only molecular); 2) with boundary conditions when the tangential component of the vector or its normal component is continuous or when the vector disappears completely in a vacuum.

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