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The magnetic susceptibility is negative for
A
paramagnetic material only.
B
ferromagnetic material only.
C
paramagnetic and ferromagnetic materials.
D
diamagnetic material only.
Explanation
Only diamagnetic materials have negative susceptibility.
Detailed Solution
Magnetic susceptibility $\chi_m = \frac{M}{H}$ and $\mu_r = 1 + \chi_m$
For diamagnetic materials $\mu_r < 1$, so $\chi_m < 0$ (negative).
For paramagnetic and ferromagnetic materials $\mu_r > 1$, so $\chi_m > 0$ (positive).
For diamagnetic materials $\mu_r < 1$, so $\chi_m < 0$ (negative).
For paramagnetic and ferromagnetic materials $\mu_r > 1$, so $\chi_m > 0$ (positive).