SAT Subject Physics Practice Question 283: Answer and Explanation

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Question: 283

54. A superconductor 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 supercooled 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

Correct Answer: E

Explanation:

E is the definition of a superconductor. (A describes a particle accelerator/collider, and B describes a device known as a tokamak.)

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