{HEAD ~ A reactor} according to this invention comprises {TAIL ~ an annular iron core} constituting a closed magnetic path and a conductor wound on the iron core, the iron core being formed of particles of iron or an iron based magnetic material each covered with an insulative oxide film containing 0.3 to 0.8% of oxygen by weight based on the particle 
comprises
{ HEAD ~ A reactor } according to this invention comprises { TAIL ~ an annular iron core } constituting a closed magnetic path and a conductor wound on the iron core , the iron core being formed of particles of iron or an iron based magnetic material each covered with an insulative oxide film containing 0.3 to 0.8 % of oxygen by weight based on the particle
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