Magnetic angler. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Magnetic angler. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

From cork, foam, pine bark, you can make small fish. Insert a needle into each of them. Let the fish swim in the basin, and arm yourself with a fishing rod with a small magnet instead of a hook. You don't have to complain about a bad bite!

Things will go even more successfully if the needles in the mouths of the fish are also magnetized. But it is difficult: they are very small. Better do this: take a large steel needle or knitting needle, magnetize it, and then break it into pieces with two pliers. Do not hit with a hammer: the magnets are demagnetized by a blow.

magnetic angler

Wait a minute, but a magnet has the strongest poles. So, even from a long needle, only two good magnets will come out? Will all averages fail? But no! Break the spoke in half - and both ends, which were just in the middle, will become full-fledged poles. They will attract or repel no worse than those that were around the edges from the very beginning! And no matter how small pieces you break the magnet, you will never be able to get one single pole. No, any magnet will always have two poles!

Author: Galpershtein L.Ya.

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Fullerenes can be dangerous 14.08.2004

Preliminary studies by American hygienists suggest that fullerenes - round hollow molecules consisting of several dozen carbon atoms - can be harmful to the body.

Fullerenes were first obtained in 1985; they can be used in microelectronics, as an additive to lubricants, in fuel cells. Pharmacists want to use these nanometer-sized beads (a nanometer is one thousandth of a micrometer) as supermicroscopic pills, filling them with drugs and injecting them into the patient's bloodstream. They are also used in cosmetics, filling with cosmetics.

However, experiments on fish conducted at the University of Dallas (USA) have shown that fullerenes can accumulate in liver cells and brain neurons, changing the functioning of genes in these cells and damaging cell membranes.

The degree of toxicity of ultramicroscopic carbon balls is estimated as average between nickel and benzopyrene, a carcinogen found in tobacco smoke and car exhaust. If you add fullerenes to the water with daphnia floating in it at a concentration of only 0,8 milligrams per liter, after two days half of the daphnia dies.

According to unpublished data of other researchers, fullerenes are also toxic to rodents.

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