Discussion
A semiconductor strain gauge of factor 120 and resistance 350 \( \Omega \) is strained by 0.0001. The resistance change is
Answer: B
The product is \( 350 \times 120 \times 0.0001 = 4.2\ \Omega \), against 0.07 ohm for a metallic gauge of factor two on the same strain. The sixty-fold advantage is real but comes with poor linearity and heavy temperature dependence.
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