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A strain gauge with nominal resistance R = 330 Ω is installed in a branch of a Wheatstone bridge having for unstrained strain gauge R₁=R2=R3=R4=R and Vi=10V. As a result of bending the beam, the strain gauge is subjected to a strain. A digital voltmeter with input resistance Rm = 10 Ω gives a reading of Vo=5mV. Calculate; a. change of resistance AR, b. the strain & for gauge factor G = 2.
Sagot :
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