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Member since:
July 30, 2008
Total points:
105 (Level 1)

## Resolved Question

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# If the cross-section of a wire of fixed length is doubled, how does the resistance of that wire change?

Halved

Doubled

Unchanged

Member since:
November 09, 2007
Total points:
833,120 (Level 7)

## Best Answer - Chosen by Voters

double the cross sectional area, and the resistance is cut in half.

But you said just "cross-section", which could mean diameter.

Double the diameter and the area goes up by 4, which means the resistance goes down by 4.

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• Member since:
July 16, 2008
Total points:
1,843 (Level 3)
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.
• Member since:
May 31, 2008
Total points:
95,099 (Level 7)
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

### Source(s):

College physics.