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NEET PHYSICSEasy

The magnetic susceptibility is negative for

A

paramagnetic material only

B

ferromagnetic material only

C

paramagnetic and ferromagnetic materials

D

diamagnetic material only

Step-by-Step Solution

  1. Definition: Magnetic susceptibility (χ\chi) is a measure of how a magnetic material responds to an external magnetic field.
  2. Diamagnetic Materials: For diamagnetic substances, the magnetic field lines are repelled or expelled from the material. The induced magnetization is opposite to the direction of the external field. Consequently, the magnetic susceptibility is small and negative (−1≤χ<0-1 \le \chi < 0) .
  3. Paramagnetic Materials: These substances are weakly attracted by a magnetic field. Their susceptibility is small and positive (0<χ<ϵ0 < \chi < \epsilon) .
  4. Ferromagnetic Materials: These substances are strongly attracted by a magnetic field. Their susceptibility is large and positive (χ≫1\chi \gg 1) .
  5. Conclusion: Only diamagnetic materials exhibit negative magnetic susceptibility.
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