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