Прочитайте текст. Electricity and magnetism combine to form one of the fundamental forces of the uni...: ответ на тест 1072618 - Английский язык

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Electricity and magnetism combine to form one of the fundamental forces of the universe – electromagnetism. The two constantly interact, and the relationship between them is one of the most important in physics. For example, an electric current passing through a wire creates a magnetic field; and if the lines of force around a magnet are cut by passing object, an electric current will be produced.
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Electricity and magnetism combine to form one of the fundamental forces of the universe – …

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Electromagnetism
1. Electricity and magnetism combine to form one of the fundamental forces of the universe – electromagnetism. The two constantly interact, and the relationship between them is one of the most important in physics. For example, an electric current passing through a wire creates a magnetic field; and if the lines of force around a magnet are cut by a passing object, an electric current will be produced.
2. Magnets are attracted to iron and to any material that contains iron. Magnets have two poles, a north pole and a south pole. Unmagnetized iron and steel have magnetic regions of atoms called domains that are jumbled up and point in lots of different directions. When iron or steel becomes magnetized, the domains become aligned and they all point in the same direction. One end of each domain points toward the magnetic north pole.
3. Electronics is a new branch of physics, and one that plays an increasingly important part in our lives. It is concerned with the use of electricity to produce signals that carry information and control devices such as computers. These devices contain electric circuits through which electric current flows. The controlling parts in a circuit are called components, and these include diodes and transistors. Components can amplify currents, switch them on and off, or change their direction.
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The relationship of electricity and magnetism …

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Magnets are attracted to iron and to any material that contains iron. Magnets have two poles, a north pole and a south pole. Unmagnetized iron and steel have magnetic regions of atoms called domains that are jumbled up and point in lots of different directions. When iron or steel becomes magnetized, the domains become aligned and they all point in the same direction. One end of each domain points toward the magnetic north pole.
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Magnets are attracted to iron and to any material that contains …

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The related movements on the Earth, the moon, and the sun provide us with our marks of time. A full day and night is the time taken for the Earth to complete one turn on its axis. The time taken for the moon to orbit the Earth is one month. The Egyptians were the first people to measure time, about 5000 years ago. They divided their days into two periods of twelve equal hours, as we do today. The first timepieces included sundials and other clock forms that measured the changes in levels of water or sand. These were inaccurate, and it was not until the 1600s that the more reliable pendulum clock was invented by the Dutch scientist Christian Huygens.
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The Egyptians were the first people to …

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1_______
2_______,
We refer to our letter of 23rd September when we explained to you the advantages of our new “Recordon” machine.
We are so certain that this machine will be of great assistance to you that we are writing again to you.
Perhaps there are some points which our letter did not make clear. If so 3_______ and we will gladly supply any additional information you want.
Our invoice, however, has not been fully paid by you. You have not covered
4_______,
Richard Anderson

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1_______
Dear Gentlemen,
Our firm has developed a unique technology of mince-machines production. 2_______that your firm is in the same line so we might have common interests in business. Besides, our firm has all the necessary means of production and skilled labor.
We hope that you will be interested to learn more about our possibilities and, in the future, to hold talks on the possibility to organize a joint venture.3_______.
Yours respectfully,
4_______