A broken match becomes whole again. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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A broken match becomes whole again. Focus Secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

You take a handkerchief out of your pocket and place it on the table. Ask one of the spectators to take a match from the matchbox and mark it “so that it cannot be replaced.” Wrap this match in a scarf.

You address the audience with the words: “Please break this match.” The request is willingly fulfilled. You put a handkerchief with a broken match on the table, unwrap it - the match turns out to be intact! Is this the match? There's no doubt about it - it's the same one, that's the mark.

Focus secret:

You place a match in the border of the scarf in advance. When you place the scarf on the table, do it so that the border is facing you. You place the match that the audience marked in the middle of the scarf. You need to wrap it in a scarf in a clever way.

First, cover the lying match with the side of the scarf that is closer to you (here the second match is hidden in the border), then with the opposite side of the scarf, then with the right and finally the left side of the scarf. The marked match is located behind one layer of the scarf, you hold it with your hand, and you let the audience break the second, previously hidden match; naturally, they cannot feel that they are breaking the “wrong match.” All that remains is to put the scarf on the table and unfold it, making a few “magic movements” and saying a few “magic words”.

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Creation of strong magnetic fields by a pulse of laser light 06.04.2020

During the last decade or even two, strong magnetic fields have been used in many areas of science and technology, including materials science, medicine, and the like. However, the hardware that makes it possible to obtain such magnetic fields is far behind in development compared to the ever-increasing needs. Not so long ago, a research team from the University of Ottawa and some other Canadian scientific institutions found a new way to generate high-strength magnetic fields using pulses of laser light. Moreover, the same method makes it possible to "turn on and off" the magnetic field very quickly, which opens up a number of completely new prospects for its practical use.

The work done by Canadian scientists is based on the results of previous studies, which were aimed at using lasers to accelerate the process of generating a magnetic field. In these studies, pulses of laser light were used to drive electrons in a plasma in a circular path, but this approach requires the use of extremely powerful lasers, which are rare in themselves and are available only to a small number of laboratories worldwide.

During the new research, scientists used a laser beam not with vortex, as before, but with azimuth-vector polarization. The electric field in such a beam has the form of radial circles around the center of the beam, and this field causes the plasma electrons to move along an annular path, which generates a magnetic field directed along the direction of the laser light beam. To synchronize the movement of electrons, the light of the second laser is used, the frequency of which is twice as high as the frequency of the first, and this method makes it possible to achieve an accelerated movement of electrons at the moment of the peak of the electric field strength created by the light of the first laser.

The calculations performed showed that the main laser pulse with an energy of 11.3 microjoules and an additional pulse with an energy of 1.9 microjoules and a doubled frequency are able to generate a magnetic field with a strength of 8 Tesla, which will last for 50 femtoseconds. And the alternation of pulses will allow you to get a pulsed magnetic field, which will act almost constantly. However, if this approach is used to study the properties of magnetic materials, then the rapid switching on and off of such a strong magnetic field will most likely simply destroy the samples under study, and a number of additional protective measures will be required to prevent this.

However, in the form in which it exists today, the new laser method for generating strong magnetic fields can already be used in the fields of optoelectronics and spintronics to create high-speed keys and switches that ensure the operation of devices based on the mentioned technologies.

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