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Question:

Identify the following magnetic materials:(i) A material having susceptibility (x_m) = -0.00015.(ii) A material having susceptibility (x_m) = 10^-5.

Solution:

X_m < 0 diamagnetic
X_m > 0 paramagnetic
X_m >> 1 ferromagnetic
where X_m is magnetic susceptibility
i) X_m = -0.00015
hence, its (diamagnetic)
ii) X_m = 10^-5 > 0
hence its paramagnetic