"Magnetic line of force" Quotes from Famous Books
 ... force which rotate at right angles about it as shown at A in Fig. 32. The magnetic field produced by the current flowing in the coil is precisely the same as that set up by a permanent steel magnet. Conversely, when a magnetic line of force is set up a part of its energy goes to make up electric currents which whirl about in a like manner, as shown ...
— The Radio Amateur's Hand Book • A. Frederick Collins |
