CUET · PHYSICS · PYQ PAPER 2023
Which of the following statements is correct?
- A materials exhibiting Meissner effect are diamagnstic and have \(\chi=-1\) and \(\mu_x=0\).
- B Materials that get weakly magnetised when placed in an external magnetic field and have \(\chi>0\) and \(\mu_\tau>1\) are called ferromagnetic materials.
- C At high enough temperature, a paramagnet becomes a ferro magnet and gets strongly magnetised.
- D Super conductors are the ferromagnetic materials that are strongly repelled in an external magnetic field.
Answer & Solution
Correct Answer
(A) materials exhibiting Meissner effect are diamagnstic and have \(\chi=-1\) and \(\mu_x=0\).
Step-by-step Solution
Detailed explanation
Superconductors are "perfect diamagnets" that expel all magnetic fields (Meissner effect). For these materials, the magnetic susceptibility \(\chi\) is exactly \(- 1\), which leads to a relative permeability \(\mu_r\) of zero \(\left(\mu_r=1+\chi\right)\). A) materials…
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