Out of the two magnetic materials, $\text{'}A\text{'}$ has relative permeability slightly greater than unity while $\text{'}B\text{'}$ has less than unity. Identify the nature of the materials $\text{'}A\text{'}$ and $\text{'}B\text{'}$. Will their susceptibilities be positive or negative ?

A uniform magnetic field gets modified as shown below when two specimens $X$ and $Y$ are placed in it. Identify whether specimens $X$ and $Y$ are diamagnetic, paramagnetic or ferromagnetic.

A uniform magnetic field gets modified as shown below, when two specimens $X$ and $Y$ are placed in it. State the reason for the behaviour of the field lines in $X$ and $Y$ for diamagnetic, parmagnetic substances.