| Consider the following statements regarding superconductivity. |
| 1. Superconductivity is a phenomenon observed in several metals and ceramic materials. |
| 2. Superconductivity is a phenomenon of exactly zero electrical resistance. |
| 3. It shows expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. |
| 4. It is not characterised by the Meissner effect, in which complete ejection of magnetic field lines from the interior of the superconductor. |
| Which of the statements given above are correct? |
A) 1, 3 and 4
B) 1, 2 and 3
C) 1 and 2
D) All of these
Correct Answer: B
Solution :
[b] Statement 1, 2 and 3 are correct as, superconductivity is a phenomenon observed in several metals and ceramic materials, also it shows exactly zero electrical resistance. It also shows expulsion of magnetic fields. Statement 4 is incorrect. It is characterised by the Meissner effect, in which complete ejection of magnetic field lines from the interior.
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