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A strain gauge with GF=2 (gauge factor) senses a strain of 500 us (micro strain)

Electrical Engineering

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A strain gauge with GF=2 (gauge factor) senses a strain of 500 us (micro strain). For a 120 2 gauge, how small
is the resistance changes and how do you do to accurately measure that change? Note that GF=(AR/R)(AL/L)
= (AR/R)/ E.