When the temperature decreases below a critical value for many materials, their electrical resistivity drops to zero, and the materials become superconductors.

What does a normal conductor become a superconductor?

1. When does a normal conductor become a superconductor? Explanation: The temperature at which a normal conductor loses its resistivity and becomes a superconductor is known as transition temperature or critical temperature. ... Since the superconductor also expels magnetic lines of force it behaves as a perfect diamagnet.

How does a conductor become a superconductor?

Artwork: Superconductivity happens when electrons work together in Cooper pairs. Called the BCS theory in honor of its three discovers, it explains that materials suddenly become "superb conductors" when the electrons inside them join forces to make what are called Cooper pairs (or BCS pairs).