Magnetism And Matter

A material behaves as a superconductor below a critical temperature and as a normal conductor above . A magnetic field is applied when . The material is then cooled below in the presence of . Which of the following figures represents the correct configuration of magnetic field lines?

The temperature dependence of magnetic susceptibility (Column I) of certain magnetic materials (Column II) are given below. Which of the following options is/are correct?

Column I	Column II
(1)	(P) Diamagnetic
(2)	(Q) Paramagnetic
(3)	(R) Ferromagnetic
(4)	(S) Antiferromagnetic

An infinite one-dimensional lattice extends along the x-axis. At each lattice site, there exists an ion with spin 1/2. The spin can point either in the +z or -z direction only. Let , , and denote the entropies of paramagnetic, ferromagnetic, and antiferromagnetic configurations, respectively. Which of the following relations is/are true?

A particle of mass is moving in the potential

Figures P, Q, R, and S show different combinations of the values of and .