Persistent current
![Persistent current schematic. The green arrow indicates the direction of static applied magnetic field B which allows a net current I (blue arrow) to flow and create a magnetization M (black arrow) by breaking the symmetry between clockwise and counterclockwise currents. The yellow dot represents an electron traversing the disordered material of the ring (green stars) without dissipation. A typical ring current is 1 nanoampere for a ring diameter of 0.6 micrometer at a temperature below 0.5 kelvin.[3]](/uploads/202502/02/Persistent_Current_Ring5940.png)
Persistent current is a perpetual electric current, not requiring an external power source.
Persistent current
英语百科
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