Which of the following best describes superconductors? ...

[lbcchick]

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

[leahm14]

Answer to Question 1

2

Answer to Question 2

4