Concept: Magnetic Attraction

A magnet attracts materials that are ferromagnetic. Ferromagnetic materials are those that can be permanently magnetized and are strongly attracted to magnets. The most common ferromagnetic materials are iron, nickel, and cobalt, and some of their alloys.

Step-by-Step Analysis:

Step 1: Identify ferromagnetic materials. Iron is ferromagnetic, so any substance containing iron in a form that retains its magnetic properties will be attracted to a magnet.

Step 2: Evaluate each option:

• Mixture of iron and sulphur: Iron is ferromagnetic, so this mixture will be attracted.
• Aluminium chloride: Aluminium is not ferromagnetic; it is paramagnetic (weakly attracted) but not strongly attracted like iron. Aluminium chloride is a compound and not attracted by a magnet.
• Copper sulphide: Copper is not ferromagnetic; it is diamagnetic (repelled by magnets). Copper sulphide, being a compound of copper, is not attracted.
• Copper turnings: Copper is diamagnetic and not attracted to magnets.

Step 3: Conclusion: Only the mixture of iron and sulphur contains a ferromagnetic material (iron) and will be attracted by a magnet.

Final Answer: Magnet attracts mixture of iron and sulphur.

Related Topics:

• Ferromagnetism: Materials like iron, nickel, cobalt that are strongly attracted to magnets.
• Paramagnetism: Materials weakly attracted to magnets (e.g., aluminium, oxygen).
• Diamagnetism: Materials repelled by magnets (e.g., copper, water).
• Magnetic properties of elements and compounds.

Key Formulae and Theory:

Magnetic susceptibility $\chi$ indicates how a material responds to a magnetic field:

• Ferromagnetic: $\chi \gg 0$ (very large and positive)
• Paramagnetic: $\chi >0$ (small and positive)
• Diamagnetic: $\chi <0$ (negative)

The force of attraction depends on the magnetic permeability of the material and the strength of the magnet.