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# Resistance

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Can a copper wire and a tungsten wire of the same length have the same resistance?

(a) yes, but only if the tungsten wire has a greater cross-sectional area
(b) yes, but only if the copper wire has a greater cross-sectional area
(c) yes, under any circumstances

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## SOLUTION This solution is FREE courtesy of BrainMass!

(b) yes, but only if the copper wire has a greater cross-sectional area.

Resistance = Resistivity x Length / Area

The resistivity(numerator) of Copper is greater than the resistivity of Tungsten. Therefore, the copper wire should have a greater cross-sectional area (denominator) in order for its resistance to be equal to that of a tungsten wire of same length.

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