Hi All, I've done a quick google, and I can't find anything obvious (first 3 pages) about the formation of magnetic fields, specifically, how does the distribution of magnetic field through space take place as an electrical coil is switched on? As a secondary question, is it possible to "pinch" a region of space with temporally short, but spatially much more concentrated magnetic field? As in, say a steady state magnetic field generated by a coil is about 1T in the bore, how does it approach this value when switched on? Is there any oscillation (overshoot) in field strength before settling? Thanks for any insights.