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Resistance is directly related to the cross-sectional area of a wire, so for each scenario you gave, the effect for resistance should be the same.
R1=(ro)XL/A,R2=(ro)XL/2A,then R2/R1=(ro)XL/2A / (ro)XL/A=1/2,
so the resistance will be halved
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If the cross-section of a wire of fixed length is doubled, how does the resistance of that wire change?