Lynde, Carleton John, b. 1872 · New York : Macmillan · leaf 192
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 the coil… … 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
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
