如果将 100 Ω电阻应变片贴在弹性试件上,若试件受力横截面积 S = 0. 5 ×10 -4 m 2 ,弹性模量E =2×10 11 N/m 2 ,若有F=5×10 4 N的拉力引起应变电阻变化为1 Ω。试求该应变片的灵敏度系数?
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