If I design a coil driver for a certain application, I assume there is a fixed load right? It may have drive any inductance between an interval but you can not drive any coil, because the driver is designed for a certain application.
So, how does a coil's inductance change with a magnet's presence?
Assume I want to drive the coil with sinus wave. Just under the coil, there is a magnet that its center is fixes to a shaft and its in release.
So, say that my coil is designed to draw peak to peak 1A in 10KHz.
How would that change? How can we calculate the change?