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# Drift Velocity Question - how Resistance changes when increase wire length by 0.1%? watch

1. "When this gauge is stretched the length is increased by 0.1% but its cross-sectional area remains the same. What is the change in the resistance of the gauge?"

I know the equations I=nAvq and R=pL/a, where p is resistivity.

I just cannot understand how you would work this out. Please can somebody explain?

Any help would be greatly appreciated,
Thanks!
2. That might be a question about a strain gauge

anyway
R=ρL/a

tells you that if a is constant and ρ is constant then R is directly proportional to L

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