Electricity and magnetism for advanced students (1920)
Starling, Sydney George, 1873- · London Longmans, Green · leaf 325
ay also be defined as the mutual potential energy of the twocircuits when unit current is flowing in each, and this again leads tothe same value of m when the permeability is constant. Let /o be the current in the secondary circuit, and let it be situatedin a magnetic field whose value at the point… … Fig. 308, CHAP. length I of the circuit, is i^Hl sin 6, and is at right angles to I and H. Let the element Z be displaced in the direction of the force by an amount 8x, then work done = i^H sin 0.l.8x. But H sin $ is the component of H normal to the area l.Sx swept out by the element(Fig. 308…
Electricity · Magnetism
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