#### Mechanical Equivalent of an Inductor is a Mass

The mechanical analog of an inductor is a mass. The voltage across an inductor corresponds to the force used to accelerate a mass . The current through in the inductor corresponds to the velocity of the mass. Thus, Eq.(E.4) corresponds to Newton's second law for an ideal mass:

where denotes the acceleration of the mass .

From the defining equation for an inductor [Eq.(E.3)], we see that the stored magnetic flux in an inductor is analogous to mass times velocity, or momentum. In other words, magnetic flux may be regarded as electric-charge momentum.

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