Question

Poisson’s ratio of a metal is 0.35. Neglecting the piezo resistive effect, the gauge factor of the strain gauge made up of this metal is:

• A. 0.65
• B. 1
• C. 1.35
• D. 1.70

Hint:

Use the formula \( \text{Gauge Factor} = 1 + 2\mu \) for metals when piezoresistive effects are negligible.

Answer 1

The Correct Option is D

Gauge factor (GF) for a metallic strain gauge (ignoring piezoresistive effect) is given by: \[ \text{GF} = 1 + 2\mu \] where \( \mu \) is Poisson's ratio. Given \( \mu = 0.35 \): \[ \text{GF} = 1 + 2(0.35) = 1 + 0.70 = 1.70 \]