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I was looking through Physics Olympiad problems and I found this. This question asks: Find the equivalent resistance between the points A and B, all the arms have equal resistance $R$.

I understand that the network is self similar and I can take the resistance of the whole network as a Variable and the solve for it, but I can't seem to understand how to do so for A and B. Any hints or suggestions to how to approach this would be highly appreciated. Thank you in advance.

Tausif Hossain
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A hint. Would it make any difference if you joined (with a wire of zero resistance) each junction on the top row to the junction directly below it on the bottom row?

Philip Wood
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