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| 1. |
Superconductors are those elements |
| Answer» <html><body><p> Whose resistance falls almost to zero at very low temperatures</p><br/><br/><p>Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic <a href="https://interviewquestions.tuteehub.com/tag/fields-987430" style="font-weight:bold;" target="_blank" title="Click to know more about FIELDS">FIELDS</a> occurring in certain <a href="https://interviewquestions.tuteehub.com/tag/materials-1089380" style="font-weight:bold;" target="_blank" title="Click to know more about MATERIALS">MATERIALS</a> when cooled below a characteristic critical temperature. It is characterized by the Meissner <a href="https://interviewquestions.tuteehub.com/tag/effect-966056" style="font-weight:bold;" target="_blank" title="Click to know more about EFFECT">EFFECT</a>, the <a href="https://interviewquestions.tuteehub.com/tag/complete-423576" style="font-weight:bold;" target="_blank" title="Click to know more about COMPLETE">COMPLETE</a> ejection of magnetic field lines from the interior of the superconductor as it transitions into the superconducting state. The electrical resistivity of a metallic conductor decreases gradually as temperature is lowered. In a superconductor, the resistance drops abruptly to zero when the material is cooled below its critical temperature. An <a href="https://interviewquestions.tuteehub.com/tag/electric-967871" style="font-weight:bold;" target="_blank" title="Click to know more about ELECTRIC">ELECTRIC</a> current flowing in a loop of superconducting wire can persist indefinitely with no power source.</p></body></html> | |