Please answer the folloiwng, this question has been asked before on Chegg howeve

Question

Please answer the folloiwng, this question has been asked before on Chegg however all answers are incorrect.

Which of the following are reasons that strain gauges, which are sensors that measure strain point in a structure, are used in a Wheatstone Bridge configuration? It allows you to measure small variation in strain with good resolution. You have more redundancy in using four strain gauges rather than one. It allows you to measure the large voltages that result from the strain gauge. It zeros out effects of thermal expansion

Explanation / Answer

The working of strange gauge is based on the change in it's resistance in response to strain.

The wheatstone bridge circuit gives output whenever there is even a small variation in resistance thereby allowing us to measure to small variations in strain. The sensitivity can be increased by the factor of 2 using two gauges in a bridge in opposite arms one in compression and the other in tension.

There is also some errors in measurment because of change in temperature as the expansion in material causes the change in resistivity and sensitivity. If we use strain gauges in all the four arms the temperature's effect is compensated by this bridge itself as the change in resistance because of change in temperature is same in all the 4 arms thereby minimising the overall error.

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