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Principle behind strain gauge is _____________

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Principle behind strain gauge is _____________

(a) variable resistance

(b) variable inductance

(c) variable capacitance

(d) variable contact area

The question was posed to me during an online exam.

The above asked question is from Pressure Transducers topic in portion Physiological Transducers of Biomedical Instrumentation

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The correct choice is (a) variable resistance

The explanation is: The principle behind strain gaude is the variable resistance. The transducer is based upon the changed in resistance of a wire produced due to small mechanical displacement. A linear relation exists between the deformation and electrical resistance of a suitable selected gauge over a specified range.

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