Consider the following statements:
1. Superconductors exhibit normal conductivity behaviour above a transition temperature Tc
2. Superconductors lose their superconducting nature in an external magnetic field, provided the external magnetic field is above a critical value.
3. High Tc, superconductors have T, values in the range 1 to 10 K.
Which of the above statements are correct?1
1 and 2 only
2
1 and 3 only
3
2 and 3 only
4
1, 2 and 3