Прочитайте текст и определите какой из заголовков соответствует тексту An electric current is a flow...: ответ на тест 607485 - Английский язык

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An electric current is a flow of electricity. There are two kinds of electricity, positive and negative. Glass rubbed with silk is positively charged, ebonite rubbed with fur is negatively charged.
Like charges repel, unlike charges attract. The leaf electroscope is used to detect, distinguish and measure charges.
The ultimate particle of negative electricity is called the electron; that of positive is called the proton.

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An electric current is a flow of electricity. There are two kinds of electricity, positive and negative. Glass rubbed with silk is positively charged, ebonite rubbed with fur is negatively charged.
Like charges repel, unlike charges attract. The leaf electroscope is used to detect, distinguish and measure charges.
The ultimate particle of negative electricity is called the electron; that of positive is called the proton.

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In the space surrounding every magnet there exists what is called a magnetic field. When a strong magnet is brought close to a piece of sort iron, the iron takes on all the properties of a magnet. This phenomenon is called induction and it was discovered by Faraday.

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This is a workshop. Two students are here. They are Sveta and Oleg. They are electricians. A toolboard is in the middle of the workshop. Many tools are on the toolboard. They are chisels, screwdrivers, a pair of pliers, a set of spanners, etc.
A safety-notice is above the toolboard. A bench is on left and a shelf is on the right. There are many nails, nuts and screws on the shelf. A hammer is not on the shelf, it is on the bench. Sveta is to the right of the bench. Oleg is on the other side of the workshop just opposite the toolboard.

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Any instrument for measuring electricity is known as an ammeter. An ammeter is used for measuring current in amperes. The abbreviation for the ampere is amp. there are very delicate ammeters that are used for measuring very small current. They are known as a milliammeter and a microammeter. The device for reading a thousands of an ampere is called a milliammeter while a microammeter is a device for reading a millionth of an ampere.

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All engineering materials are divided into metals and  non-metals. Copper, cast iron, aluminium are examples of metals. Rubber, plastic and ceramics are examples of non-metals. Today different metals are widely used in machine-building industry.