Question 91:
easy33. According to Curie’s law, the magnetic susceptibility of a substance at an absolute temperature T is proportional to: (2003)
According to Curie's law for paramagnetic substances, magnetic susceptibility is inversely proportional to absolute temperature $T$, i.e., $\chi = \frac{C}{T}$, or $\chi \propto 1/T$.
Question 92:
easy20. A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from: (2018)
When the diamagnetic rod moves out of the magnetic field, it modifies the magnetic flux through the electromagnet. To maintain the magnetic field and current against the back emf, the current source does extra work, which provides the gained gravitational potential energy.