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Dec. 20th, 2006 10:42 pmВ детской книге про электричество прочёл следующее:
An electric motor consists of a coil of wire held in a magnetic field made by a permanent magnet. A flow of electrons (current) is sent through the coil. The magnet affects the moving electrons and makes the coil turn.
Пока что я понимаю. Но дальше:
This is because the current makes a magnetic field around the wire. The current is sent through the wire in such a way that to start with, the north pole of the magnet lines up with the north pole of the magnetic field around the wire. The two poles repel each other, and this causes the coil to turn toward the unlike pole of the permanent magnet. Just before the coil lines up north-south with the magnet and gets fixed in position, the flow of electricity is sent the other way. Now the north pole of the coil has become its south pole...
Государи мои научные физики! Я понимаю, что авторам детской книжки совсем не хочется говорить о векторном произведении (или там "правиле правой руки") для вычисления силы магнитного поля, действующей на движущийся заряд. Но разумно ли такое объяснение работы электромотора?
An electric motor consists of a coil of wire held in a magnetic field made by a permanent magnet. A flow of electrons (current) is sent through the coil. The magnet affects the moving electrons and makes the coil turn.
Пока что я понимаю. Но дальше:
This is because the current makes a magnetic field around the wire. The current is sent through the wire in such a way that to start with, the north pole of the magnet lines up with the north pole of the magnetic field around the wire. The two poles repel each other, and this causes the coil to turn toward the unlike pole of the permanent magnet. Just before the coil lines up north-south with the magnet and gets fixed in position, the flow of electricity is sent the other way. Now the north pole of the coil has become its south pole...
Государи мои научные физики! Я понимаю, что авторам детской книжки совсем не хочется говорить о векторном произведении (или там "правиле правой руки") для вычисления силы магнитного поля, действующей на движущийся заряд. Но разумно ли такое объяснение работы электромотора?