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Internal Iranian politics are strange enough, and the record of those countries which have actually built atomic weapons is placid enough [the Bomb seems to have a remarkable moderating effect on even the most unstable regimes], that one can hardly speculate what developments over there will lead to.
That said, and remarking that Ray Chuang is quite right about the magnitude of the weapon and the arrnagement of the circumstances which turned out all the lights in Honolulu [but lit up the sky brighter than any streetlamp], quite a few things would survive. All kinds of older electronics would be mostly OK: the lights went out in Honololu because the voltage surge induced in the power lines tripped the circuit breakers, and it took hours to get the power plants restarted. The problem is semiconductor junctions, because the induced voltage on a micro-scale can push them past breakdown voltage, and then they're no good anymore; there is also the possibility that capacitors could be blown up, but that's a secondary issue. Fortunately, it is possible to build parallel junctions which will take up the shock. Most civilian equipment isn't built this way, but mil-spec semiconductors usually are.
In fine, then, your vacuum-tube radio will work; anything which has only germanium diodes and transistors will probably be fine; and "hardened" electronics, and probably most things inside Faraday cages [conductive shields; many PCs have at least partial ones, to avoid interference problems] should be OK. Your iPod will be toast, and you'll have to reset all your circuit breakers.
I could write all night about the effects of atomic weapons, but I don't think anyone wants to read that.
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