Question: When a straight wire is heated, its resistance changes according to the equation R = R 0? [1 + ?(T ? T 0 )] (Eq.
When a straight wire is heated, its resistance changes according to the equation
R = R0?[1 + ?(T ? T0)]
(Eq. 17.7), where is the temperature coefficient of resistivity.
(a) Show that a more precise result, which includes the fact that the length and area of a wire change when it is heated, is
![Ro[1+ (T-) 1+ ' (T- o [1 + 2' (T- 3)] R:](https://dsd5zvtm8ll6.cloudfront.net/si.experts.images/questions/2022/11/636a678ae9df4_706636a678ada35d.jpg){kind=small}
where ?? is the coefficient of linear expansion.
(b) Compare the two results for a 2.00-m-long copper wire of radius 0.100 mm, starting at 20.0?C and heated to 100.0?C.
Ro[1+ (T-) 1+ ' (T- o [1 + 2' (T- 3)] R:
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