Question

True or false all materials can be magnetized if the magnet is strong enough

Answer 1

False.

Explanation in brief:
- Only ferromagnetic (and ferrimagnetic) materials can be made into permanent magnets that keep substantial magnetization after the external field is removed. Examples: iron, cobalt, nickel, some alloys.
- Paramagnetic materials (many metals, oxygen, etc.) are weakly magnetized only while an external field is present; they do not retain significant magnetization once the field is gone.
- Diamagnetic materials (copper, silver, gold, most organic substances) are very weakly repelled by a field and cannot be turned into a permanent magnet.
- Some materials can change magnetic behavior under extreme conditions (very high fields, low temperature, pressure, or chemical changes), but that’s different from saying any material can be permanently magnetized simply by making the magnet stronger.

So you can induce some magnetization in most materials with a strong enough field, but you cannot generally make every material into a permanent magnet.