Describe super conductivity. State its applications.
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Superconductivity is a phenomenon of exactly zero electrical resistance. 

Superconductivity is a quantum mechanical phenomenon. It is characterized by the Meissner effect 

The electrical resistance 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. 


Applications:- Some of the technological applications of superconductivity includes: The production of sensitive magnetometers based on SQUIDs (superconducting quantum interference devices) Fast digital circuits Powerful superconducting electromagnets used in maglev trains, magnetic resonance imaging (MRI) and Nuclear magnetic resonance(NMR) machines, magnetic confinement fusion reactors (e.g. tokamaks), and the beam-steering and focusing magnets used in particle accelerators Low-loss power cables RF and microwave filters (e.g., for mobile phone base stations, as well as military ultrasensitive/selective receivers) Fast fault current limiters High sensitivity particle detectors, including the transition edge sensor, the superconducting bolometer, the superconducting tunnel junction detector, the kinetic inductance detector, and the superconducting nano wire single-photon detector Railgun and Coilgun magnets Electric motors and generators

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