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