![]() ![]() The outer sphere can be ignored, it is just the boundary of the simulation volume. To picture the results in 3D, mentally revolve the half-circle about the z axis at the left. This is an axisymmetric simulation around the z axis. ![]() To answer this question, I ran a simple simulation with and without an iron core in the excellent FEMM field solver. Meanwhile a naive application of the Biot-Savart law would suggest that the field outside the solenoid does not change. Other sources seem to suggest the opposite, namely that the ferromagnetic core increases the range of the field. Some sources seem to suggest that the field will be confined more closely when a ferromagnetic core is used, as is the case for ferrite-core transformers. But what I’m more interested in is: what is the effect of the ferromagnetic core on the field outside the solenoid, some arbitrary distance away? This question is interesting when using such a coil as part of a magnetically-coupled data or power transfer system, or when considering the electromagnetic interference produced by such a solenoid. ![]() The ferromagnetic core becomes temporarily magnetized and reinforces the magnetic field. It is well known that the magnetic field will be significantly stronger inside such a solenoid, compared to an air core solenoid. ![]()
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