Advanced theory of electricity and magnetism; A text-book for colleges and technical schools (1915)
Franklin, William S. (William Suddards), 1863-1930, MacNutt, Barry, 1878-1936. joint author · New York, Macmillan · leaf 90
Fig. 56. ELECTROMAGNETS. MAGNETISM OF IRON. 79 & = ^TtZi (i) in which Z is the number of turns of wire in the coil, and iis the strength of the current in- the wire in abamperes. Whenthe current is expressed in amperes we have: cr 4t IO Zi (2) … Fig. 57. Proof of equation (i) above.—Before proceeding to the deriva-tion of equation (i), it is necessary to find an expression for thetotal work W done in keeping the current * in a coil constantwhile the magnetic flux through the opening of the coil is in-creased by a specified amount $; W…
Electricity · Magnetism
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