Question

If a magnetic material is having magnetic susceptibility (χ) = –1, then the relative magnetic permeability (μ_τ) and type of magnetic material is 
1. 1, paramagnetic 
2. 0, diamagnetic
3. –1, diamagnetic
4. 2, ferromagnetic

Answer 1

Correct Answer - Option 2 : 0, diamagnetic

The correct answer is 0, diamagnetic.

• Paramagnetic materials
  • It is attracted to magnetic fields, hence having a relative magnetic permeability greater than one (or, equivalently, a positive magnetic susceptibility).
  • The magnetic moment induced by the applied field is linear in the field strength and rather weak.
  • Here, X=−1
  • then μr​=1+X⇒μr​=1+(−1)=1−1=0
  • Since the magnetic susceptibility of a given material is less than one. Therefore, the given magnetic material is diamagnetic. Hence, Option 2 is correct.
  • Superconductors have magnetic susceptibility -1.
  • Examples of superconductors: niobium-titanium, germanium-niobium, and niobium nitride, mercury, lead.
  • Any perfect conductor would exhibit perfect diamagnetism is called superconductors.
  • So it is diamagnetic.
  • Relative magnetic permeability is zero.