Question

Which of the following statement is true for superconductors? A superconductors is:

• A. A device used to study the collisions of subatomic particles that have been accelerated to near light speeds
• B. A hollow, doughnut-shaped device containing a strong magnetic field for confinement of very high temperature plasmas
• C. An element used to generate high-energy coherent laser light
• D. An element whose super-cooled vapor fills a cloud chamber to detect the tracks of charged particles when they initiate condensation of the vapor
• E. An element or alloy whose electrical resistivity vanishes when cooled to extremely low temperatures

Answer 1

Answer: (E)

An element or alloy whose electrical resistivity vanishes when cooled to extremely low temperatures

The element whose electrical conductivity is very high at low temperatures and decreases with increase in temperature are known as superconductors.

Thus at low temperature, high electrical conductivity implies that the resistivity is vanished when it is cooled to extremely low temperatures.