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Question

Conductivity of superconductor is
  1. Infinite
  2. Very large
  3. Very small
  4. Zero

A
Infinite
B
Zero
C
Very large
D
Very small
Solution
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Answer is A.

Superconductors are materials that conduct electricity with no resistance. This means that, unlike the more familiar conductors such as copper or steel, a superconductor can carry a current indefinitely without losing any energy. They also have several other very important properties, such as the fact that no magnetic field can exist within a superconductor.
Superconductors already have drastically changed the world of medicine with the advent of MRI machines, which have meant a reduction in exploratory surgery. Power utilities, electronics companies, the military, transportation, and theoretical physics have all benefited strongly from the discovery of these materials.
Hence, the conductivity of superconductor is infinite.

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