Magnetic susceptibility is negative for which type of material?

Question

G1 Physics · Accepted Answer

Step 1: Magnetic susceptibility is χₘ = M/H, where M is magnetisation along the applied magnetic field H. Step 2: For diamagnetic substances magnetisation is antiparallel to the applied field, so χₘ < 0. Step 3: Paramagnets and ferromagnets have positive susceptibility. Therefore D. Final answer: (D) diamagnetic material only.