Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 192
/ N^^ \/ ^ MAGNETISM AND THE ELECTROMAGNET 177 noticed, however, that at the middle of the coil both fields movein the same direction. A magnetic needle placed at the middleis turned in the same direction by the magnetic field of bothsides of the coil. In fact, the magnetic field about every partof… … FIG. 125. — A straight electromagnet. the iron becomes a strong magnet. If we stop the current, theiron ceases to be a magnet. A soft iron bar wound with insu-lated wire is an electromagnet. The electromagnet is the most useful form of magnet becauseit is under our control. It becomes a magnet when…
Physics · Home Economics
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