Bob - think about a pulse with 50,000 A rise in just over a microsecond.
Followed by several more in the same range. Lots of electrons are moving, each
with its own built in magnetic field. And they add up to a whole lot of lines
of force in a very small space.
It's been over forty years since I had any interest, and even then it was in
generating voltages that would make those big sparks, but if I remember
correctly the max field strength measured close to 5 gauss per ampere.
A magnetic field that intense and changing that rapidly induces unhealthy
voltages and currents in any conducting object within a few yards of the plasma
"conductor" carrying that current. The field strength in an MRI is nowhere that
intense, nor does it change that rapidly.
73 Pete
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