Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 190
el magnets we have been studying are called permanent magnets.An electromagnet consists of a core of soft iron magnetized byan electric current. It is a magnet only when the current isflowing. Of the two, th electromagnet is the more important. THE ELECTROMAGNET Oersteds discovery. — In 1819 a Dane… … FIG. 122. —Oersteds experiment. because it showed for the first time that there is a relation be-tween electricity and magnetism.If the needle is under the wire, the north pole turns in one 176 PHYSICS OF THE HOUSEHOLD direction ; if it is above the wire, it turns in the opposite direction. If the…
Physics · Home Economics
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