Is it true curret flowing through a super conducting loop will go on for ever??
is it practically possible?
Answer:
It is true. It is not yet practical though because the amount of energy necessary to keep the superconducting material cold enough to be a superconductor is greater than the amount of energy lost through normal conduction.
In theory I believe it is. In actually there is always some catch. Even in super conductivity there is resistance although it is suppose to be very low causing minimal energy loss.
True, and in use today. An MRI (Magnetic Resonance Imaging) machine depends on the use of a large, superconducting electromagnet. They supercool the winding of the magnet with liquid Helium, then connect up a DC power supply. They increase the current output of the power supply to as much as 800 Amps or so, then connect the ends of the superconducting winding to one another and remove the power supply. This current will flow for years if the winding remains cold. See this:
http://www.howstuffworks.com/question610...
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