Enemy of magnetism. Fun physical experience at home

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Enemy of magnetism. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Unfortunately, the magnet has an irreconcilable enemy that robs it of its amazing power. That enemy is heat. After all, how good it would be to make powerful electromagnets, which play the role of cranes at the plant, not only carry heavy steel and iron products, but also lift and carry, for example, red-hot iron beams. However, iron heated to a certain temperature loses its magnetic properties, and even the most powerful magnet will not attract it.

Let's check it out experimentally.

Strengthen the needle hanging on the thread, as in the previous experiment, against a strong magnet. Only reduce the distance from the end of the needle to the magnet to a few millimeters. The needle will hang horizontally, held on one side by the thread, on the other side by the attraction of the magnet.

Enemy of magnetism

Bring a burning match to the end of the needle. The needle, having warmed up, will immediately fall. When it cools down, it can again be placed in a horizontal position.

Now try to very slowly bring the burning match to the end of the needle. As soon as you notice that the needle starts to drop, immediately remove the match. The needle, not having time to get very hot, will return to its place at the magnet.

Enemy of magnetism

Perhaps it is best to take not a thread, but a piece of nichrome wire from a spiral of an old electric stove. Such a wire does not burn out and is not magnetized. And in order not to get burned, make a loop at one of its ends, pass a pin through this loop, which you stick into the cork. Attach a small nail or pin to the other end of the wire. The rest of the experiment is carried out in the same way as described above.

Author: Rabiza F.V.

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