Electrical Resistance

(Created prior to 1993)


Question:
Two copper wires have the same mass and, necessarily, the same 
volume.  The first wire is twice as long as the second.  What is the ratio of 
their resistances?
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Resistance is proportional to length and inversely proportional 
to cross-sectional area.  Another way to work the problem is to imagine two 
identical wires of resistance R laid (1) side by side.  The total resistance 
is R/2 (2) end to end.  The total resistance is 2R.

mooney
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