| ASSERTION: A disc shaped magnet is levitated above a superconducting material that has been cooled by liquid nitrogen. |
| REASON: Super conductors repel a magnet. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
Since superconductors exist only below a certain critical temperatures and above that temperature they behave like normal materials. When magnet is placed above superconductor and cooled using liquid nitrogen. The induced magnetic field inside the superconductor is exactly equal and opposite in direction to the applied magnetic field, so that they cancel within the super conductor. These poles will repel each other and the force of repulsion is enough to float the magnet.
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