All magnetic materials lose their magnetic properties

Correct option is D

The correct answer is (d) when heated

Explanation:
• All magnetic materials lose their magnetic properties when heated to a certain threshold temperature.
• Heating imparts thermal energy to the atoms, which disrupts and randomizes the aligned magnetic domains.

Information Booster:
• The specific temperature at which a ferromagnetic material loses its permanent magnetism is known as the Curie temperature.
• Above the Curie point, materials transition to behaving as paramagnetic substances.

Additional Knowledge:
when immersed in water (Option a)
• Immersing a magnet in water does not alter its internal domain structure.
when immersed in oil (Option b)
• Oil is a neutral medium and has no physical impact on a magnet's core properties.
on bringing pieces of iron closer (Option c)
• Bringing iron closer induces magnetism in the iron but does not destroy the original magnet's properties.
None of the above/More than one of the above (Option e)
• This is incorrect because heating is a scientifically proven method for demagnetization.

So the correct answer is (d)