Consider two copper wires. one has twice the length of the other. how do the resistivities of these two wires compare?

The resistivity  of a wire is related to its length L by the following relationship:

where R is the resistance of the wire, and A its cross-sectional area. 
Assuming that the resistance R and the area A are the same for the two wires, we can see from the formula that, if the length L is doubled, then the resistivity  becomes half of the original value. In fact, replacing L with 2 L we get

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