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Вопрос № 284149 - Английский язык

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An electroscope is a sensitive instrument for detecting small electric charges. It consists of a glass-jar closed with a stopper of insulting material in which is fitted a varnished glass-tube. A rod passes through the tube. At the top of the rod there is a metal ball or disc and at the bottom of the rod two pieces of gold leaf are suspended. When a charge is brought near the electroscope, a charge of opposite sign is induced on the metal ball, and a charge of the same sign appears on the two of the gold leaves. Since, the two pieces of gold leaf now have charges of like sign they repel each other.
Варианты ответов
  • Electoscope
  • Electrode Tube
  • A Glass Rod
  • A Glass-Tube
Тип вопроса: Вопрос с одним правильными вариантом
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Вопрос задал(а): Анонимный пользователь, 10 Ноябрь 2020 в 00:48
На вопрос ответил(а): Анастасия Степанова, 10 Ноябрь 2020 в 00:48

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An electroscope is a sensitive instrument for detecting small electric charges. It consists of a glass-jar closed with a stopper of insulting material in which is fitted a varnished glass-tube. A rod passes through the tube. At the top of the rod there is a metal ball or disc and at the bottom of the rod two pieces of gold leaf are suspended. When a charge is brought near the electroscope, a charge of opposite sign is induced on the metal ball, and a charge of the same sign appears on the two of the gold leaves. Since, the two pieces of gold leaf now have charges of like sign they repel each other.
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The polarity of a charge may be determined by means of an electroscope. We charge the electroscope negatively by touching the ball with a rod of hard rubber which is rubbed with flannel or silk. If the unknown charge is brought to the electroscope it will induce on the ball a charge of opposite polarity and on the gold leaves a charge of the same polarity as that of the unknown charge. Therefore, if the unknown charge is negative, the gold leaves will repel each other; if it is positive, they will attract.
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Вопрос № 284153

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Вопрос № 284159

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The cloud of electrons formed in the space between cathode and the plate is called space charge. The space charge is negative and hence has a repelling effect on electrons emitted from the cathode. The amount of the plate current depends on the space charge and the relative strength of the electric field set up by the positive plate voltage.
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Fluid milk for commercial distribution is usually pasteurized, that is subjected to the temperature of 61,70 C for at least 30 min or 71,70 C for 15 sec. and then cooled and bottled. The importance of safety and cleanliness is stressed in the dairy industry. Milk may also be condensed or evaporated, dried, powdered or separated into skim milk and cream.
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Вопрос № 284167

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Drying, salting, cold storage, freezing, bottling and canning are methods used to preserve vegetables and fruit. If foods are kept for a few days in the air, they spoil because of the action of yeasts, bacteria and other types of microorganisms. Food preserving methods destroy these organisms or prevent their re – entry or slow down their growth.
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