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Thermal emf can be prevented by _________

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in Electrical Measurements by (148k points)
Thermal emf can be prevented by _________

(a) using more sensitive galvanometers

(b) using similar metals

(c) by separating the dissimilar metals

(d) reducing the supply emf

I got this question in an internship interview.

My query is from Measurement Errors in a Wheatstone Bridge in section Measurement of Resistance of Electrical Measurements

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The correct answer is (a) using more sensitive galvanometers

The best I can explain: Thermal emf can be eliminated by making use of sensitive galvanometers consisting of copper coils and copper suspension systems. Dissimilar metals can’t be physically separated.

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