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The short answer:

Yes.

The longer answer for those curious ones: Yes, temperature affects the strength of a magnet. Colder temperatures will permit the magnetic field strength to increase a bit and hotter temperatures will decrease it a bit.

What happens at really high temperatures?

There is a point called the Curie point or Curie temperature (Tc) at which the magnetic properties disappear altogether. This temperature varies from material to material. The material's magnetic domains are no longer "held in place" by the metallic crystal matrix when the Tc is exceeded. The atoms have too much kinetic energy and a random distribution of alignments of the domains will occur. Bye bye magnetism, hello paramagnetism.

The effects can be demonstrated by a simple experiment.

You need a bar magnet, a thin rope and a hand full of carpet tacks. Secure one end of the rope to the magnet. (so that you do not burn yourself in experiment later.)

Freeze the magnet. Pick up some tacks. Take them off and count them. Record the data.

Drop the magnet in boiling water. Pick up tacks again. Take them off and count them. Record the data. Compare the data. Repeat a few times. Compare the data from all runs. You should find that the magnet is stronger the colder it is.

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15y ago

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