General Science - Physics
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Q.

Zero electrical DC resistance is a characteristic of:

 A.

Insulators

 B.

Semiconductors

 C.

Superconductors

 D.

Metals

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Solution:
Option(C) is correct

Superconductors are also able to maintain a current with no applied voltage whatsoever, a property exploited in superconducting electromagnets such as those found in MRI machines.

Experiments have demonstrated that currents in superconducting coils can persist for years without any measurable degradation. Experimental evidence points to a current lifetime of at least 100,000 years.


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