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NEET PHYSICSEasy

The best suited curve showing the variations of susceptibility (χ\chi) of a paramagnetic material in free space with temperature (TT) is:

A

Option 1

B

Option 2

C

Option 3

D

Option 4

Step-by-Step Solution

  1. Nature of Paramagnetism: According to the provided Chemistry source, paramagnetism arises from the presence of unpaired electrons, where the magnetic moment is associated with spin and orbital angular momentum . These individual atomic dipoles tend to align with an external magnetic field.
  2. Temperature Dependence (Curie's Law): The alignment of these dipoles is opposed by thermal agitation. Curie's Law states that the magnetic susceptibility (χ\chi) of a paramagnetic material is inversely proportional to the absolute temperature (TT): χ=CT\chi = \frac{C}{T} where CC is the Curie constant.
  3. Graphical Representation: The mathematical relationship χ∝1/T\chi \propto 1/T represents a rectangular hyperbola. The curve should start with a high value of χ\chi at low TT and decrease asymptotically towards zero as TT increases. Option 2 typically represents this hyperbolic decay in standard exam diagrams.
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