Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 174
t; when he says per-manent magnet he means a piece of hard steel whichhas been magnetized. In referring to a piece of irontemporarily magnetized he calls it an armature or a core. LESSON 12. Electro-Magnetism. It is well known that all the effects due to a naturalmagnet or an artificial magnet, can… … Fig. 89. Magnetic Field due to Electric Current. Question I. What is electro-magnetism? Answer. It is the magnetic effect produced by a flow** electric current. Question 2. Does a wire carrying current have amagnetic field? 175 176 ELEMENTARY ELECTRICITY Answer. Yes. Pass a straight wire carrying a…
Electricity
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