Abstract
The theorem that a generator, when connected to a system capable of doing mechanical work, supplies during the motion an amount of energy of which half appears as an increase in the energy of the system and half is used in the performance of mechanical work, is applied to prove that the force in any direction x between a coil carrying an alternating current I and a body in which eddy currents are induced by the field of the coil is ½I2(∂L/∂x) where L is the effective inductance of the coil. The theorem is also used to show that waves of intensity J propagated with a velocity c possess a momentum J/c2 per unit volume.
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