Disappearing magnet. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Disappearing magnet. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

"It was just there - just not there" - this is how one foreign magician used to say when various things he had laid out on the table disappeared before the eyes of astonished spectators. Maybe the magician really didn't speak Russian very well. Or maybe he did it on purpose, for fun. Anyway, I remember this funny phrase for many years.

Now we will also do this trick with you. Only balls, not scarves, not live pigeons, but ... a magnet will disappear. Rather, it will remain in place, but ... However, do not get ahead of yourself.

Pick up an iron bolt with a diameter of 10 mm and a length of at least 100 mm. Wind on it 15 m of insulated copper wire with a diameter of 0,2-0,3 mm. Wind tightly, coil to coil. You wind one row 5-6 cm long, continue to wind the second over it, then the third, until all the wire runs out. There should be about four hundred turns. Stepping back 10 cm from each end, tie the wire with a thick thread and tie these threads tightly around the bolt so that the winding does not fall apart. Clean the ends of the winding from insulation.

Let's get to the experience. Come on, try to pull the head of the bolt pins, nails - in a word, any steel and iron trifle. No, it doesn't pull. Our bolt is not suitable for magnets.

Well, now attach the ends of the winding to the terminals of the battery from a flashlight. Try again - pulls! Why are there pins - healthy bolts, pliers, or even something heavier! The bolt has become a magnet!

Disappearing Magnet

You ask: what does a foreign magician have to do with it? And here's what. Say his magic formula and turn off the battery. Boom, bang, bang! All pieces of iron at the same moment fall off the bolt. The bolt is no longer a magnet. "Just what was - just what is not!"

Turn on the battery again - and the bolt will again become a magnet. This magnet is not permanent, but temporary. It works only as long as the current flows through the winding. Therefore, it was called an electromagnet, an electric magnet.

An electromagnet is stronger and lighter than a permanent magnet, and most importantly, it is very convenient that it can be controlled. "Just what was - just what is not!" Therefore, electromagnets are very widely used in technology.

Author: Galpershtein L.Ya.

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