Magnetism and Matter question for NEET / JEE Main, with solution

Answer: (A) diamagnetic

Concept. The sign of $\chi = \mu_r - 1$ identifies the type of material.

Step 1. Susceptibility. $\chi = 0.9995 - 1 = -5 \times 10^{-4}$.

Step 2. Classify. A small negative susceptibility ($\mu_r$ slightly less than $1$) is diamagnetic. A superconductor would have $\chi = -1$.

Answer. Diamagnetic (Option A).

Solution by Sreeraj P, M.Sc Physics