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# Copper is not used as potentiometer wire because?

Last updated date: 05th Aug 2024
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Hint: A potentiometer works on the idea of a uniform potential drop along the length of the potentiometer wire, allowing the length of wire for the null point to correspond to a specific value of potential and so calculating potential.

Complete step-by-step solution:
The potential declines across the resistor in a resistive circuit, not across the conductor, because the conductor allows for easy current conduction by definition. Copper, as a good conductor, will not show a smooth potential drop over its length. As a result, using a Copper wire as a potentiometer wire will be impractical. Because copper wire has a high temperature coefficient of resistance and low resistivity, it is not appropriate for potentiometers. As a result, even a slight change in temperature can result in a large change in resistance, affecting the experimental circumstances.

2. Use a very long and thin Copper wire, with turns put close together so that it can fit in a length of at le1ast ${10^2}m$ to provide appropriate resistance - as resistance is proportional to length. This may be a really accurate potentiometer if it's well-made.