Answer to Question #171322 in Electrical Engineering for Thelston

Question

A platinum wire has Poisson’s ratio ν = 0.39, and resistivity ρ of 1.06 x 10-7 ohm-meter. When the wire is pulled, the axial strain εA is 0.08 and the resistivity increases to 1.07 x 10-7 ohm-meter. What is the gauge factor of the platinum wire? (

Answer 1

To find the gauge factor, we can use the following equation:

$$GF=1+2\nu+\frac{(\rho_i-\rho_f)/\rho_i}{\epsilon}=1.66.$$