Experiments with magnetic needles. Entertaining physical experiments at home

ENTERTAINING EXPERIENCES AT HOME
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Experiments with magnetic needles. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Lubricate the magnetized needle with a very thin layer of fat, and then place it on the surface of the water. The needle, floating on the water, will turn one end to the south, the other to the north. Get a compass.

Do another experiment with several needles, also magnetized. Take five needles and pierce them with five small - 1,3 cm in diameter - circles cut out of waterproof cardboard (from milk bags). The circles should be exactly the same, and the needles should be stuck exactly in the center, releasing the ends at the same distance from the circles.

Pour water into a deep glass or aluminum (but not iron!) bowl and lower two needles in circles with the tip up onto its surface. Needles will float well vertically due to their floats. Place them side by side, but so that the float circles do not touch each other and so that surface tension does not pull them together. Make the distance between the circles one centimeter. The needles will immediately float away from each other for a certain distance and freeze in place. This distance at the needles is obviously the limit when the magnetic forces are balanced. Bring the end of the magnet to the needles from a great distance. If this is the same pole as the ends of the needles, they will immediately move apart even more.

Experiments with magnetic needles

If it is the opposite pole, the needles will reach for it and get closer. But when you remove the magnet, the needles will move apart again.

Now lower the float with the third needle into the water. Each float with a needle will take place in one of the corners of an equilateral triangle. Bring to the center of the triangle the core of the manufactured magnet or one magnetized rod made from a straightened paper clip. The needles will either scatter in different directions, or come together.

Remove the magnet - the needles will again take their original places.

Do this experiment with four, five, six needles. Each time they will occupy a certain place in relation to each other, until a certain magnetic equilibrium occurs between them. Three needles form a triangle, four - a square, five - either a pentagon or a square with one needle in its very center.

It should be noted that a strict geometric figure for the arrangement of needles is not always obtained. And the degree of magnetization can be different, and the sizes of the needles and floats themselves are different.

Do this experiment with a large number of magnetized needles. I wonder what shapes they form?

Author: Rabiza F.V.

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