Which of the following best describes superconductors?
1.conductors that have less than half the resistivity of iron
2.conductors with essentially no resistance below a critical temperature, peculiar to each material
3.conductors which have a drop in their resistivity as their temperatures are lowered
4.Conductors are materials which are very useful in a variety of ways; hence the name superconductor.
Question 2
A length of wire has a resistance R. The wire is then uniformly stretched to double its original length. What resistance results. Hint: When the wire is stretched, its volume remains constant.
1. R/2
2. R
3. 2R
4. more than 2R
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