{HEAD ~ A reactor} according to this invention comprises 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 {TAIL ~ each} covered with an insulative oxide film containing 0.3 to 0.8% of oxygen by weight based on the particle 
{ HEAD ~ A reactor } according to this invention comprises 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 { TAIL ~ 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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