A metal has strain gauge factor of two. Its nominal resistance is 120 ohms. If it undergoes a strain of 10^-5, the value of change of resistance in response to the strain is
- A. 4.8 × 10^-3 ohm
- B. 3.6 × 10^-3 ohm
- C. 2.4 × 10^-3 ohm
- D. 1.2 × 10^-3 ohm
Answer: C. 2.4 × 10^-3 ohm
Explanation: Strain gauge resistance change ΔR = G × ε × R = 2 × (10 × 10^-6) × 120 = 2.4 × 10^-3 Ω.