If an EMP were detonated at 50,000 over Columbus Ohio how long would the magnetic effects last?

What kinds of mechanical items we be able to bring back on line first? How would the new electric cars fare? What would be the effective range and effect of a100 kilo-ton bomb at this altitude? ar 40,000? at 30,000? at 20,000? Could a steam vehicle like the old Stanley Steamer be constructed out of... show more What kinds of mechanical items we be able to bring back on line first? How would the new electric cars fare?

What would be the effective range and effect of a100 kilo-ton bomb at this altitude? ar 40,000? at 30,000? at 20,000?

Could a steam vehicle like the old Stanley Steamer be constructed out of non-magnetic materials to serve as transport while the effect is at its zenith?
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