#### 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:

*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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