Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in ____________ in the electrical resistance of the wire ?
Correct answer: D. Increase
- A. No change
- B. Decrease
- C. Exponential decrease
- D. Increase
Explanation
Resistance follows R = ρL/A, so stretching increases the wire length while reducing its cross-sectional area. Both changes increase the resistance, which is the basis of strain-gage measurement.
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