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In metallic gauges resistance changes due to _______

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In metallic gauges resistance changes due to _______

(a) temperature

(b) current

(c) voltage

(d) dimension

I have been asked this question in examination.

The origin of the question is Characteristics of Resistance Wire Strain Gauge in chapter Transducers of Electrical Measurements

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Correct choice is (d) dimension

To explain I would say: The resistance varies in metallic gauges due to a change in the dimensions of the metallic gauge. Germanium and silicon are the materials used in metallic gauges.

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