Assume that the increase and decrease in the resistance of the strain gage element is by the same number of △R. Determine the unbalanced voltage equation.
(a) V = – Vdc×(△R/R)
(b) V = – Vdc×(△R/R+△R)
(c) V = Vdc×(△R/R)
(d) V = – Vdc×[(△R+ R)/R].
I had been asked this question in final exam.
The query is from High Frequency Op-Amp Equivalent Circuit in portion Operational Amplifier Applications of Linear Integrated Circuits