Английский язык

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in the study of electricity it is customary to divide the subject into electrostatics and electrodynamics. the first deals with electricity at rest, the second with electricity in motion. this division of the subject is convenient because electricity in motion has important properties that are not possessed by electricity at rest. one of these extra properties is the production of a magnetic field by a wire when carrying a «current» of electricity; another is the heating of the wire, and still another is the side thrust experienced by the wire if it cuts across a magnetic field produced by some other source. this last property is utilized in all electric motors. we must weep in mind, however, that the minute electrically charged particles, electrons and protons are essentially the same whether in motion or at rest. if a rod of sealing wax, glass, or of hard rubber is rubbed with flannel or silk, it is found that both the rod and the object with 45 which it is rubbed, exhibit for a short time a slight attraction for bits of paper, cork and other materials. it is said that bodies which exhibit this sort of attraction are electrified and the agency which imparts this property is called electricity or an electric charge.

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