A disc shaped magnet levitate above a superconducting material that has been cooled by iquid nitrogen.This happens because
Answers
Explanation:
First we need to understand what is a superconductor. When the temperature of a liquid is slowly decreased, Its resistance also starts decreasing. At a certain low temperature, the resistance of the material becomes zero. This means that, the material doesn't offer resistance to current flow. Hence, material is known as superconductor. There would be no heating effect, therefore no heat loss.
The superconductor doesn't allow passage of magnetic field lines. A current is developed which it excludes or repels any magnetic field lines near it. The superconductor acts as Diamagnet. This effect is known as Meissner Effect. Hence, when a disc shaped magnet is brought near to superconducting material, the superconductor repels the magnetic field of the magnet and the magnet levitates above it.