निम्नलिखित मौलिक अतिचालक (superconducting) पदार्थों में से किसका क्रांतिक तापमान (Tc) सबसे अधिक होता है?

A superconductor may be efficiently used for generating which of the following?

The relationship between the critical magnetic field Hc at temperature T and the transition temperature Tc for a superconductor is given by:

When a material enters the superconducting state: