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meseasky said:if all the resistors in the network are the same,
i think the equivalent R is R1/4
you can put the pb in this way: as the network is infinit, at point A, the 4 directions are all the same, so with an input current of Iin at A, there will be only 1/4 Iin going through R1.
so the votage drop on R1 is (1/4 Iin*R1), where comes from the answer