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Metals in strain gauge construction have _______

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Metals in strain gauge construction have  _______

(a) non-linear temperature coefficient

(b) linear temperature coefficient

(c) tangential temperature coefficient

(d) exponential temperature coefficient

I have been asked this question in unit test.

I'd like to ask this question from Strain Gauge Measurement Technique topic in portion Transducers of Electrical Measurements

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Correct answer is (b) linear temperature coefficient

Easy explanation: The metals used in a strain gauge construction have a linear temperature coefficient. A change in the temperature affects the resistance and varies the value of strain.

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