Question

A strain gauge experience 2% change of resistance when subjected to a strain of 8000 micron. The gauge factor of the strain gauge is ?

• A. 25
• B. 0.25
• C. 250
• D. 2.5

Answer 1

The correct option is D 2.5

$\text{Gauge factor}=\frac{\text{\% change in reistance}}{\text{\% change in length}}$

$\lambda =\frac{\Delta R/R}{\Delta L/L}$

$Given,\Delta R/R=2\%=0.02$

$\Delta L/L=8000\times {10}^{-6}$

$\lambda =\frac{0.02}{8000\times {10}^{-6}}$

$\lambda =2.5$