Alternating currents in conductors: wide rectangular slab
If we move from the semi-infinite slab, with its mathematically simple solutions but abstract realisation, to a slab of finite thickness, where the current can flow in both sides at the same time, then we get slightly more complex solutions but more practical conditions. The flat bus-bar which is much wider than its thickness is a good approximation to this; although small surface currents will flow in the two narrow edges, these can be ignored in the first instance.
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