Magnetostatics

The magnetization need not be static.

The equations of magnetostatics can be used to predict vast magnetic switching events that occur on timescales of nanoseconds or less.

Magnetostatics is even a good approximation when the currents are not static, as long as the currents do not alternate rapidly.

Magnetostatics is widely used in applications of micromagnetics such as models of magnetic storage devices as in computer memory.

This is especially important for my field of study.

It is probably how our flash memory chips work with our various interfaces.