Needles ${\mathrm{N}}_1,{\mathrm{N}}_2$ and ${\mathrm{N}}_3$ are made of a ferromagnetic, paramagnetic and diamagnetic substance respectively. Magnet when brought close to them will

A perfectly diamagnetic sphere has a small spherical cavity at its centre, which is filled with a paramagnetic substance. The whole system is placed in a uniform magnetic field $\overrightarrow{\mathrm{B}}$. Then the field inside the paramagnetic substance is:

Consider the regular array of vertical identical current-carrying wires (with the direction of current flow as indicated in the figure below) protruding through a horizontal table. If we scatter some diamagnetic particles on the table, they are likely to accumulate-